creation_sourcecode: // $KATANA - The sun is rising.
  // https://t.me/katanaportal
  
  // SPDX-License-Identifier: MIT
  pragma solidity 0.8.20;
  pragma experimental ABIEncoderV2;
  
  /**
   * @dev Provides information about the current execution context, including the
   * sender of the transaction and its data. While these are generally available
   * via msg.sender and msg.data, they should not be accessed in such a direct
   * manner, since when dealing with meta-transactions the account sending and
   * paying for execution may not be the actual sender (as far as an application
   * is concerned).
   *
   * This contract is only required for intermediate, library-like contracts.
   */
  abstract contract Context {
      function _msgSender() internal view virtual returns (address) {
          return msg.sender;
      }
  
      function _msgData() internal view virtual returns (bytes calldata) {
          return msg.data;
      }
  }
  
  /**
   * @dev Contract module which provides a basic access control mechanism, where
   * there is an account (an owner) that can be granted exclusive access to
   * specific functions.
   *
   * By default, the owner account will be the one that deploys the contract. This
   * can later be changed with {transferOwnership}.
   *
   * This module is used through inheritance. It will make available the modifier
   * `onlyOwner`, which can be applied to your functions to restrict their use to
   * the owner.
   */
  abstract contract Ownable is Context {
      address private _owner;
  
      event OwnershipTransferred(
          address indexed previousOwner,
          address indexed newOwner
      );
  
      /**
       * @dev Initializes the contract setting the deployer as the initial owner.
       */
      constructor() {
          _transferOwnership(_msgSender());
      }
  
      /**
       * @dev Returns the address of the current owner.
       */
      function owner() public view virtual returns (address) {
          return _owner;
      }
  
      /**
       * @dev Throws if called by any account other than the owner.
       */
      modifier onlyOwner() {
          require(owner() == _msgSender(), "Ownable: caller is not the owner");
          _;
      }
  
      /**
       * @dev Leaves the contract without owner. It will not be possible to call
       * `onlyOwner` functions anymore. Can only be called by the current owner.
       *
       * NOTE: Renouncing ownership will leave the contract without an owner,
       * thereby removing any functionality that is only available to the owner.
       */
      function renounceOwnership() public virtual onlyOwner {
          _transferOwnership(address(0));
      }
  
      /**
       * @dev Transfers ownership of the contract to a new account (`newOwner`).
       * Can only be called by the current owner.
       */
      function transferOwnership(address newOwner) public virtual onlyOwner {
          require(
              newOwner != address(0),
              "Ownable: new owner is the zero address"
          );
          _transferOwnership(newOwner);
      }
  
      /**
       * @dev Transfers ownership of the contract to a new account (`newOwner`).
       * Internal function without access restriction.
       */
      function _transferOwnership(address newOwner) internal virtual {
          address oldOwner = _owner;
          _owner = newOwner;
          emit OwnershipTransferred(oldOwner, newOwner);
      }
  }
  
  ////// lib/openzeppelin-contracts/contracts/token/ERC20/IERC20.sol
  // OpenZeppelin Contracts v4.4.0 (token/ERC20/IERC20.sol)
  
  /* pragma solidity ^0.8.0; */
  
  /**
   * @dev Interface of the ERC20 standard as defined in the EIP.
   */
  interface IERC20 {
      /**
       * @dev Returns the amount of tokens in existence.
       */
      function totalSupply() external view returns (uint256);
  
      /**
       * @dev Returns the amount of tokens owned by `account`.
       */
      function balanceOf(address account) external view returns (uint256);
  
      /**
       * @dev Moves `amount` tokens from the caller's account to `recipient`.
       *
       * Returns a boolean value indicating whether the operation succeeded.
       *
       * Emits a {Transfer} event.
       */
      function transfer(address recipient, uint256 amount)
          external
          returns (bool);
  
      /**
       * @dev Returns the remaining number of tokens that `spender` will be
       * allowed to spend on behalf of `owner` through {transferFrom}. This is
       * zero by default.
       *
       * This value changes when {approve} or {transferFrom} are called.
       */
      function allowance(address owner, address spender)
          external
          view
          returns (uint256);
  
      /**
       * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
       *
       * Returns a boolean value indicating whether the operation succeeded.
       *
       * IMPORTANT: Beware that changing an allowance with this method brings the risk
       * that someone may use both the old and the new allowance by unfortunate
       * transaction ordering. One possible solution to mitigate this race
       * condition is to first reduce the spender's allowance to 0 and set the
       * desired value afterwards:
       * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
       *
       * Emits an {Approval} event.
       */
      function approve(address spender, uint256 amount) external returns (bool);
  
      /**
       * @dev Moves `amount` tokens from `sender` to `recipient` using the
       * allowance mechanism. `amount` is then deducted from the caller's
       * allowance.
       *
       * Returns a boolean value indicating whether the operation succeeded.
       *
       * Emits a {Transfer} event.
       */
      function transferFrom(
          address sender,
          address recipient,
          uint256 amount
      ) external returns (bool);
  
      /**
       * @dev Emitted when `value` tokens are moved from one account (`from`) to
       * another (`to`).
       *
       * Note that `value` may be zero.
       */
      event Transfer(address indexed from, address indexed to, uint256 value);
  
      /**
       * @dev Emitted when the allowance of a `spender` for an `owner` is set by
       * a call to {approve}. `value` is the new allowance.
       */
      event Approval(
          address indexed owner,
          address indexed spender,
          uint256 value
      );
  }
  
  ////// lib/openzeppelin-contracts/contracts/token/ERC20/extensions/IERC20Metadata.sol
  // OpenZeppelin Contracts v4.4.0 (token/ERC20/extensions/IERC20Metadata.sol)
  
  /* pragma solidity ^0.8.0; */
  
  /* import "../IERC20.sol"; */
  
  /**
   * @dev Interface for the optional metadata functions from the ERC20 standard.
   *
   * _Available since v4.1._
   */
  interface IERC20Metadata is IERC20 {
      /**
       * @dev Returns the name of the token.
       */
      function name() external view returns (string memory);
  
      /**
       * @dev Returns the symbol of the token.
       */
      function symbol() external view returns (string memory);
  
      /**
       * @dev Returns the decimals places of the token.
       */
      function decimals() external view returns (uint8);
  }
  
  /**
   * @dev Implementation of the {IERC20} interface.
   *
   * This implementation is agnostic to the way tokens are created. This means
   * that a supply mechanism has to be added in a derived contract using {_mint}.
   * For a generic mechanism see {ERC20PresetMinterPauser}.
   *
   * TIP: For a detailed writeup see our guide
   * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How
   * to implement supply mechanisms].
   *
   * We have followed general OpenZeppelin Contracts guidelines: functions revert
   * instead returning `false` on failure. This behavior is nonetheless
   * conventional and does not conflict with the expectations of ERC20
   * applications.
   *
   * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
   * This allows applications to reconstruct the allowance for all accounts just
   * by listening to said events. Other implementations of the EIP may not emit
   * these events, as it isn't required by the specification.
   *
   * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
   * functions have been added to mitigate the well-known issues around setting
   * allowances. See {IERC20-approve}.
   */
  contract ERC20 is Context, IERC20, IERC20Metadata {
      mapping(address => uint256) private _balances;
  
      mapping(address => mapping(address => uint256)) private _allowances;
  
      uint256 private _totalSupply;
  
      string private _name;
      string private _symbol;
  
      /**
       * @dev Sets the values for {name} and {symbol}.
       *
       * The default value of {decimals} is 18. To select a different value for
       * {decimals} you should overload it.
       *
       * All two of these values are immutable: they can only be set once during
       * construction.
       */
      constructor(string memory name_, string memory symbol_) {
          _name = name_;
          _symbol = symbol_;
      }
  
      /**
       * @dev Returns the name of the token.
       */
      function name() public view virtual override returns (string memory) {
          return _name;
      }
  
      /**
       * @dev Returns the symbol of the token, usually a shorter version of the
       * name.
       */
      function symbol() public view virtual override returns (string memory) {
          return _symbol;
      }
  
      /**
       * @dev Returns the number of decimals used to get its user representation.
       * For example, if `decimals` equals `2`, a balance of `505` tokens should
       * be displayed to a user as `5.05` (`505 / 10 ** 2`).
       *
       * Tokens usually opt for a value of 18, imitating the relationship between
       * Ether and Wei. This is the value {ERC20} uses, unless this function is
       * overridden;
       *
       * NOTE: This information is only used for _display_ purposes: it in
       * no way affects any of the arithmetic of the contract, including
       * {IERC20-balanceOf} and {IERC20-transfer}.
       */
      function decimals() public view virtual override returns (uint8) {
          return 18;
      }
  
      /**
       * @dev See {IERC20-totalSupply}.
       */
      function totalSupply() public view virtual override returns (uint256) {
          return _totalSupply;
      }
  
      /**
       * @dev See {IERC20-balanceOf}.
       */
      function balanceOf(address account)
          public
          view
          virtual
          override
          returns (uint256)
      {
          return _balances[account];
      }
  
      /**
       * @dev See {IERC20-transfer}.
       *
       * Requirements:
       *
       * - `recipient` cannot be the zero address.
       * - the caller must have a balance of at least `amount`.
       */
      function transfer(address recipient, uint256 amount)
          public
          virtual
          override
          returns (bool)
      {
          _transfer(_msgSender(), recipient, amount);
          return true;
      }
  
      /**
       * @dev See {IERC20-allowance}.
       */
      function allowance(address owner, address spender)
          public
          view
          virtual
          override
          returns (uint256)
      {
          return _allowances[owner][spender];
      }
  
      /**
       * @dev See {IERC20-approve}.
       *
       * Requirements:
       *
       * - `spender` cannot be the zero address.
       */
      function approve(address spender, uint256 amount)
          public
          virtual
          override
          returns (bool)
      {
          _approve(_msgSender(), spender, amount);
          return true;
      }
  
      /**
       * @dev See {IERC20-transferFrom}.
       *
       * Emits an {Approval} event indicating the updated allowance. This is not
       * required by the EIP. See the note at the beginning of {ERC20}.
       *
       * Requirements:
       *
       * - `sender` and `recipient` cannot be the zero address.
       * - `sender` must have a balance of at least `amount`.
       * - the caller must have allowance for ``sender``'s tokens of at least
       * `amount`.
       */
      function transferFrom(
          address sender,
          address recipient,
          uint256 amount
      ) public virtual override returns (bool) {
          _transfer(sender, recipient, amount);
  
          uint256 currentAllowance = _allowances[sender][_msgSender()];
          require(
              currentAllowance >= amount,
              "ERC20: transfer amount exceeds allowance"
          );
          unchecked {
              _approve(sender, _msgSender(), currentAllowance - amount);
          }
  
          return true;
      }
  
      /**
       * @dev Atomically increases the allowance granted to `spender` by the caller.
       *
       * This is an alternative to {approve} that can be used as a mitigation for
       * problems described in {IERC20-approve}.
       *
       * Emits an {Approval} event indicating the updated allowance.
       *
       * Requirements:
       *
       * - `spender` cannot be the zero address.
       */
      function increaseAllowance(address spender, uint256 addedValue)
          public
          virtual
          returns (bool)
      {
          _approve(
              _msgSender(),
              spender,
              _allowances[_msgSender()][spender] + addedValue
          );
          return true;
      }
  
      /**
       * @dev Atomically decreases the allowance granted to `spender` by the caller.
       *
       * This is an alternative to {approve} that can be used as a mitigation for
       * problems described in {IERC20-approve}.
       *
       * Emits an {Approval} event indicating the updated allowance.
       *
       * Requirements:
       *
       * - `spender` cannot be the zero address.
       * - `spender` must have allowance for the caller of at least
       * `subtractedValue`.
       */
      function decreaseAllowance(address spender, uint256 subtractedValue)
          public
          virtual
          returns (bool)
      {
          uint256 currentAllowance = _allowances[_msgSender()][spender];
          require(
              currentAllowance >= subtractedValue,
              "ERC20: decreased allowance below zero"
          );
          unchecked {
              _approve(_msgSender(), spender, currentAllowance - subtractedValue);
          }
  
          return true;
      }
  
      /**
       * @dev Moves `amount` of tokens from `sender` to `recipient`.
       *
       * This internal function is equivalent to {transfer}, and can be used to
       * e.g. implement automatic token fees, slashing mechanisms, etc.
       *
       * Emits a {Transfer} event.
       *
       * Requirements:
       *
       * - `sender` cannot be the zero address.
       * - `recipient` cannot be the zero address.
       * - `sender` must have a balance of at least `amount`.
       */
      function _transfer(
          address sender,
          address recipient,
          uint256 amount
      ) internal virtual {
          require(sender != address(0), "ERC20: transfer from the zero address");
          require(recipient != address(0), "ERC20: transfer to the zero address");
  
          _beforeTokenTransfer(sender, recipient, amount);
  
          uint256 senderBalance = _balances[sender];
          require(
              senderBalance >= amount,
              "ERC20: transfer amount exceeds balance"
          );
          unchecked {
              _balances[sender] = senderBalance - amount;
          }
          _balances[recipient] += amount;
  
          emit Transfer(sender, recipient, amount);
  
          _afterTokenTransfer(sender, recipient, amount);
      }
  
      /** @dev Creates `amount` tokens and assigns them to `account`, increasing
       * the total supply.
       *
       * Emits a {Transfer} event with `from` set to the zero address.
       *
       * Requirements:
       *
       * - `account` cannot be the zero address.
       */
      function _mint(address account, uint256 amount) internal virtual {
          require(account != address(0), "ERC20: mint to the zero address");
  
          _beforeTokenTransfer(address(0), account, amount);
  
          _totalSupply += amount;
          _balances[account] += amount;
          emit Transfer(address(0), account, amount);
  
          _afterTokenTransfer(address(0), account, amount);
      }
  
      /**
       * @dev Destroys `amount` tokens from `account`, reducing the
       * total supply.
       *
       * Emits a {Transfer} event with `to` set to the zero address.
       *
       * Requirements:
       *
       * - `account` cannot be the zero address.
       * - `account` must have at least `amount` tokens.
       */
      function _burn(address account, uint256 amount) internal virtual {
          require(account != address(0), "ERC20: burn from the zero address");
  
          _beforeTokenTransfer(account, address(0), amount);
  
          uint256 accountBalance = _balances[account];
          require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
          unchecked {
              _balances[account] = accountBalance - amount;
          }
          _totalSupply -= amount;
  
          emit Transfer(account, address(0), amount);
  
          _afterTokenTransfer(account, address(0), amount);
      }
  
      /**
       * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
       *
       * This internal function is equivalent to `approve`, and can be used to
       * e.g. set automatic allowances for certain subsystems, etc.
       *
       * Emits an {Approval} event.
       *
       * Requirements:
       *
       * - `owner` cannot be the zero address.
       * - `spender` cannot be the zero address.
       */
      function _approve(
          address owner,
          address spender,
          uint256 amount
      ) internal virtual {
          require(owner != address(0), "ERC20: approve from the zero address");
          require(spender != address(0), "ERC20: approve to the zero address");
  
          _allowances[owner][spender] = amount;
          emit Approval(owner, spender, amount);
      }
  
      /**
       * @dev Hook that is called before any transfer of tokens. This includes
       * minting and burning.
       *
       * Calling conditions:
       *
       * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
       * will be transferred to `to`.
       * - when `from` is zero, `amount` tokens will be minted for `to`.
       * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
       * - `from` and `to` are never both zero.
       *
       * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
       */
      function _beforeTokenTransfer(
          address from,
          address to,
          uint256 amount
      ) internal virtual {}
  
      /**
       * @dev Hook that is called after any transfer of tokens. This includes
       * minting and burning.
       *
       * Calling conditions:
       *
       * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
       * has been transferred to `to`.
       * - when `from` is zero, `amount` tokens have been minted for `to`.
       * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
       * - `from` and `to` are never both zero.
       *
       * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
       */
      function _afterTokenTransfer(
          address from,
          address to,
          uint256 amount
      ) internal virtual {}
  }
  
  /**
   * @dev Wrappers over Solidity's arithmetic operations.
   *
   * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
   * now has built in overflow checking.
   */
  library SafeMath {
      /**
       * @dev Returns the addition of two unsigned integers, with an overflow flag.
       *
       * _Available since v3.4._
       */
      function tryAdd(uint256 a, uint256 b)
          internal
          pure
          returns (bool, uint256)
      {
          unchecked {
              uint256 c = a + b;
              if (c < a) return (false, 0);
              return (true, c);
          }
      }
  
      /**
       * @dev Returns the substraction of two unsigned integers, with an overflow flag.
       *
       * _Available since v3.4._
       */
      function trySub(uint256 a, uint256 b)
          internal
          pure
          returns (bool, uint256)
      {
          unchecked {
              if (b > a) return (false, 0);
              return (true, a - b);
          }
      }
  
      /**
       * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
       *
       * _Available since v3.4._
       */
      function tryMul(uint256 a, uint256 b)
          internal
          pure
          returns (bool, uint256)
      {
          unchecked {
              // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
              // benefit is lost if 'b' is also tested.
              // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
              if (a == 0) return (true, 0);
              uint256 c = a * b;
              if (c / a != b) return (false, 0);
              return (true, c);
          }
      }
  
      /**
       * @dev Returns the division of two unsigned integers, with a division by zero flag.
       *
       * _Available since v3.4._
       */
      function tryDiv(uint256 a, uint256 b)
          internal
          pure
          returns (bool, uint256)
      {
          unchecked {
              if (b == 0) return (false, 0);
              return (true, a / b);
          }
      }
  
      /**
       * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
       *
       * _Available since v3.4._
       */
      function tryMod(uint256 a, uint256 b)
          internal
          pure
          returns (bool, uint256)
      {
          unchecked {
              if (b == 0) return (false, 0);
              return (true, a % b);
          }
      }
  
      /**
       * @dev Returns the addition of two unsigned integers, reverting on
       * overflow.
       *
       * Counterpart to Solidity's `+` operator.
       *
       * Requirements:
       *
       * - Addition cannot overflow.
       */
      function add(uint256 a, uint256 b) internal pure returns (uint256) {
          return a + b;
      }
  
      /**
       * @dev Returns the subtraction of two unsigned integers, reverting on
       * overflow (when the result is negative).
       *
       * Counterpart to Solidity's `-` operator.
       *
       * Requirements:
       *
       * - Subtraction cannot overflow.
       */
      function sub(uint256 a, uint256 b) internal pure returns (uint256) {
          return a - b;
      }
  
      /**
       * @dev Returns the multiplication of two unsigned integers, reverting on
       * overflow.
       *
       * Counterpart to Solidity's `*` operator.
       *
       * Requirements:
       *
       * - Multiplication cannot overflow.
       */
      function mul(uint256 a, uint256 b) internal pure returns (uint256) {
          return a * b;
      }
  
      /**
       * @dev Returns the integer division of two unsigned integers, reverting on
       * division by zero. The result is rounded towards zero.
       *
       * Counterpart to Solidity's `/` operator.
       *
       * Requirements:
       *
       * - The divisor cannot be zero.
       */
      function div(uint256 a, uint256 b) internal pure returns (uint256) {
          return a / b;
      }
  
      /**
       * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
       * reverting when dividing by zero.
       *
       * Counterpart to Solidity's `%` operator. This function uses a `revert`
       * opcode (which leaves remaining gas untouched) while Solidity uses an
       * invalid opcode to revert (consuming all remaining gas).
       *
       * Requirements:
       *
       * - The divisor cannot be zero.
       */
      function mod(uint256 a, uint256 b) internal pure returns (uint256) {
          return a % b;
      }
  
      /**
       * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
       * overflow (when the result is negative).
       *
       * CAUTION: This function is deprecated because it requires allocating memory for the error
       * message unnecessarily. For custom revert reasons use {trySub}.
       *
       * Counterpart to Solidity's `-` operator.
       *
       * Requirements:
       *
       * - Subtraction cannot overflow.
       */
      function sub(
          uint256 a,
          uint256 b,
          string memory errorMessage
      ) internal pure returns (uint256) {
          unchecked {
              require(b <= a, errorMessage);
              return a - b;
          }
      }
  
      /**
       * @dev Returns the integer division of two unsigned integers, reverting with custom message on
       * division by zero. The result is rounded towards zero.
       *
       * Counterpart to Solidity's `/` operator. Note: this function uses a
       * `revert` opcode (which leaves remaining gas untouched) while Solidity
       * uses an invalid opcode to revert (consuming all remaining gas).
       *
       * Requirements:
       *
       * - The divisor cannot be zero.
       */
      function div(
          uint256 a,
          uint256 b,
          string memory errorMessage
      ) internal pure returns (uint256) {
          unchecked {
              require(b > 0, errorMessage);
              return a / b;
          }
      }
  
      /**
       * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
       * reverting with custom message when dividing by zero.
       *
       * CAUTION: This function is deprecated because it requires allocating memory for the error
       * message unnecessarily. For custom revert reasons use {tryMod}.
       *
       * Counterpart to Solidity's `%` operator. This function uses a `revert`
       * opcode (which leaves remaining gas untouched) while Solidity uses an
       * invalid opcode to revert (consuming all remaining gas).
       *
       * Requirements:
       *
       * - The divisor cannot be zero.
       */
      function mod(
          uint256 a,
          uint256 b,
          string memory errorMessage
      ) internal pure returns (uint256) {
          unchecked {
              require(b > 0, errorMessage);
              return a % b;
          }
      }
  }
  
  interface IUniswapV2Factory {
      event PairCreated(
          address indexed token0,
          address indexed token1,
          address pair,
          uint256
      );
  
      function feeTo() external view returns (address);
  
      function feeToSetter() external view returns (address);
  
      function getPair(address tokenA, address tokenB)
          external
          view
          returns (address pair);
  
      function allPairs(uint256) external view returns (address pair);
  
      function allPairsLength() external view returns (uint256);
  
      function createPair(address tokenA, address tokenB)
          external
          returns (address pair);
  
      function setFeeTo(address) external;
  
      function setFeeToSetter(address) external;
  }
  
  ////// src/IUniswapV2Pair.sol
  /* pragma solidity 0.8.10; */
  /* pragma experimental ABIEncoderV2; */
  
  interface IUniswapV2Pair {
      event Approval(
          address indexed owner,
          address indexed spender,
          uint256 value
      );
      event Transfer(address indexed from, address indexed to, uint256 value);
  
      function name() external pure returns (string memory);
  
      function symbol() external pure returns (string memory);
  
      function decimals() external pure returns (uint8);
  
      function totalSupply() external view returns (uint256);
  
      function balanceOf(address owner) external view returns (uint256);
  
      function allowance(address owner, address spender)
          external
          view
          returns (uint256);
  
      function approve(address spender, uint256 value) external returns (bool);
  
      function transfer(address to, uint256 value) external returns (bool);
  
      function transferFrom(
          address from,
          address to,
          uint256 value
      ) external returns (bool);
  
      function DOMAIN_SEPARATOR() external view returns (bytes32);
  
      function PERMIT_TYPEHASH() external pure returns (bytes32);
  
      function nonces(address owner) external view returns (uint256);
  
      function permit(
          address owner,
          address spender,
          uint256 value,
          uint256 deadline,
          uint8 v,
          bytes32 r,
          bytes32 s
      ) external;
  
      event Mint(address indexed sender, uint256 amount0, uint256 amount1);
      event Burn(
          address indexed sender,
          uint256 amount0,
          uint256 amount1,
          address indexed to
      );
      event Swap(
          address indexed sender,
          uint256 amount0In,
          uint256 amount1In,
          uint256 amount0Out,
          uint256 amount1Out,
          address indexed to
      );
      event Sync(uint112 reserve0, uint112 reserve1);
  
      function MINIMUM_LIQUIDITY() external pure returns (uint256);
  
      function factory() external view returns (address);
  
      function token0() external view returns (address);
  
      function token1() external view returns (address);
  
      function getReserves()
          external
          view
          returns (
              uint112 reserve0,
              uint112 reserve1,
              uint32 blockTimestampLast
          );
  
      function price0CumulativeLast() external view returns (uint256);
  
      function price1CumulativeLast() external view returns (uint256);
  
      function kLast() external view returns (uint256);
  
      function mint(address to) external returns (uint256 liquidity);
  
      function burn(address to)
          external
          returns (uint256 amount0, uint256 amount1);
  
      function swap(
          uint256 amount0Out,
          uint256 amount1Out,
          address to,
          bytes calldata data
      ) external;
  
      function skim(address to) external;
  
      function sync() external;
  
      function initialize(address, address) external;
  }
  
  interface IUniswapV2Router02 {
      function factory() external pure returns (address);
  
      function WETH() external pure returns (address);
  
      function addLiquidity(
          address tokenA,
          address tokenB,
          uint256 amountADesired,
          uint256 amountBDesired,
          uint256 amountAMin,
          uint256 amountBMin,
          address to,
          uint256 deadline
      )
          external
          returns (
              uint256 amountA,
              uint256 amountB,
              uint256 liquidity
          );
  
      function addLiquidityETH(
          address token,
          uint256 amountTokenDesired,
          uint256 amountTokenMin,
          uint256 amountETHMin,
          address to,
          uint256 deadline
      )
          external
          payable
          returns (
              uint256 amountToken,
              uint256 amountETH,
              uint256 liquidity
          );
  
      function swapExactTokensForTokensSupportingFeeOnTransferTokens(
          uint256 amountIn,
          uint256 amountOutMin,
          address[] calldata path,
          address to,
          uint256 deadline
      ) external;
  
      function swapExactETHForTokensSupportingFeeOnTransferTokens(
          uint256 amountOutMin,
          address[] calldata path,
          address to,
          uint256 deadline
      ) external payable;
  
      function swapExactTokensForETHSupportingFeeOnTransferTokens(
          uint256 amountIn,
          uint256 amountOutMin,
          address[] calldata path,
          address to,
          uint256 deadline
      ) external;
  }
  
  contract KATANA is ERC20, Ownable {
      using SafeMath for uint256;
  
      IUniswapV2Router02 public immutable uniswapV2Router;
      address public immutable uniswapV2Pair;
      address public constant deadAddress = address(0xdead);
  
      bool private swapping;
  
      address public revShareWallet;
      address public treasuryWallet;
  
      uint256 public maxTransactionAmount;
      uint256 public swapTokensAtAmount;
      uint256 public maxWallet;
  
      bool public limitsInEffect = true;
      bool public tradingActive = false;
      bool public swapEnabled = false;
  
      bool public blacklistRenounced = false;
  
      mapping(address => bool) blacklisted;
  
      uint256 public buyTotalFees;
      uint256 public buyRevShareFee;
      uint256 public buyLiquidityFee;
      uint256 public buyTreasuryFee;
  
      uint256 public sellTotalFees;
      uint256 public sellRevShareFee;
      uint256 public sellLiquidityFee;
      uint256 public sellTreasuryFee;
  
      uint256 public tokensForRevShare;
      uint256 public tokensForLiquidity;
      uint256 public tokensForTreasury;
  
      mapping(address => bool) private _isExcludedFromFees;
      mapping(address => bool) public _isExcludedMaxTransactionAmount;
  
      mapping(address => bool) public automatedMarketMakerPairs;
  
      bool public preMigrationPhase = true;
      mapping(address => bool) public preMigrationTransferrable;
  
      event UpdateUniswapV2Router(
          address indexed newAddress,
          address indexed oldAddress
      );
  
      event ExcludeFromFees(address indexed account, bool isExcluded);
  
      event SetAutomatedMarketMakerPair(address indexed pair, bool indexed value);
  
      event revShareWalletUpdated(
          address indexed newWallet,
          address indexed oldWallet
      );
  
      event treasuryWalletUpdated(
          address indexed newWallet,
          address indexed oldWallet
      );
  
      event SwapAndLiquify(
          uint256 tokensSwapped,
          uint256 ethReceived,
          uint256 tokensIntoLiquidity
      );
  
      constructor() ERC20("KATANA", "KATANA") {
          IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(
              0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D
          );
  
          excludeFromMaxTransaction(address(_uniswapV2Router), true);
          uniswapV2Router = _uniswapV2Router;
  
          uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory())
              .createPair(address(this), _uniswapV2Router.WETH());
          excludeFromMaxTransaction(address(uniswapV2Pair), true);
          _setAutomatedMarketMakerPair(address(uniswapV2Pair), true);
  
          uint256 _buyRevShareFee = 0;
          uint256 _buyLiquidityFee = 0;
          uint256 _buyTreasuryFee = 2;
  
          uint256 _sellRevShareFee = 0;
          uint256 _sellLiquidityFee = 0;
          uint256 _sellTreasuryFee = 2;
  
          uint256 totalSupply = 100_000_000 * 1e18;
  
          maxTransactionAmount = 1_000_000 * 1e18;
          maxWallet = 1_000_000 * 1e18;
          swapTokensAtAmount = (totalSupply * 5) / 10000;
  
          buyRevShareFee = _buyRevShareFee;
          buyLiquidityFee = _buyLiquidityFee;
          buyTreasuryFee = _buyTreasuryFee;
          buyTotalFees = buyRevShareFee + buyLiquidityFee + buyTreasuryFee;
  
          sellRevShareFee = _sellRevShareFee;
          sellLiquidityFee = _sellLiquidityFee;
          sellTreasuryFee = _sellTreasuryFee;
          sellTotalFees = sellRevShareFee + sellLiquidityFee + sellTreasuryFee;
  
          revShareWallet = address(0x1AD7b52678709733B11f837604836cADfa4DD0eE);
          treasuryWallet = owner();
  
          excludeFromFees(owner(), true);
          excludeFromFees(address(this), true);
          excludeFromFees(address(0xdead), true);
  
          excludeFromMaxTransaction(owner(), true);
          excludeFromMaxTransaction(address(this), true);
          excludeFromMaxTransaction(address(0xdead), true);
  
          preMigrationTransferrable[owner()] = true;
  
          /*
              _mint is an internal function in ERC20.sol that is only called here,
              and CANNOT be called ever again
          */
          _mint(msg.sender, totalSupply);
      }
  
      receive() external payable {}
  
      // once enabled, can never be turned off
      function enableTrading() external onlyOwner {
          tradingActive = true;
          swapEnabled = true;
          preMigrationPhase = false;
      }
  
      // remove limits after token is stable
      function removeLimits() external onlyOwner returns (bool) {
          limitsInEffect = false;
          return true;
      }
  
      // change the minimum amount of tokens to sell from fees
      function updateSwapTokensAtAmount(uint256 newAmount)
          external
          onlyOwner
          returns (bool)
      {
          require(
              newAmount >= (totalSupply() * 1) / 100000,
              "Swap amount cannot be lower than 0.001% total supply."
          );
          require(
              newAmount <= (totalSupply() * 5) / 1000,
              "Swap amount cannot be higher than 0.5% total supply."
          );
          swapTokensAtAmount = newAmount;
          return true;
      }
  
      function updateMaxTxnAmount(uint256 newNum) external onlyOwner {
          require(
              newNum >= ((totalSupply() * 5) / 1000) / 1e18,
              "Cannot set maxTransactionAmount lower than 0.5%"
          );
          maxTransactionAmount = newNum * (10**18);
      }
  
      function updateMaxWalletAmount(uint256 newNum) external onlyOwner {
          require(
              newNum >= ((totalSupply() * 10) / 1000) / 1e18,
              "Cannot set maxWallet lower than 1.0%"
          );
          maxWallet = newNum * (10**18);
      }
  
      function excludeFromMaxTransaction(address updAds, bool isEx)
          public
          onlyOwner
      {
          _isExcludedMaxTransactionAmount[updAds] = isEx;
      }
  
      // only use to disable contract sales if absolutely necessary (emergency use only)
      function updateSwapEnabled(bool enabled) external onlyOwner {
          swapEnabled = enabled;
      }
  
      function updateBuyFees(
          uint256 _revShareFee,
          uint256 _liquidityFee,
          uint256 _treasuryFee
      ) external onlyOwner {
          buyRevShareFee = _revShareFee;
          buyLiquidityFee = _liquidityFee;
          buyTreasuryFee = _treasuryFee;
          buyTotalFees = buyRevShareFee + buyLiquidityFee + buyTreasuryFee;
          require(buyTotalFees <= 5, "Buy fees must be <= 5.");
      }
  
      function updateSellFees(
          uint256 _revShareFee,
          uint256 _liquidityFee,
          uint256 _treasuryFee
      ) external onlyOwner {
          sellRevShareFee = _revShareFee;
          sellLiquidityFee = _liquidityFee;
          sellTreasuryFee = _treasuryFee;
          sellTotalFees = sellRevShareFee + sellLiquidityFee + sellTreasuryFee;
          require(sellTotalFees <= 5, "Sell fees must be <= 5.");
      }
  
      function excludeFromFees(address account, bool excluded) public onlyOwner {
          _isExcludedFromFees[account] = excluded;
          emit ExcludeFromFees(account, excluded);
      }
  
      function setAutomatedMarketMakerPair(address pair, bool value)
          public
          onlyOwner
      {
          require(
              pair != uniswapV2Pair,
              "The pair cannot be removed from automatedMarketMakerPairs"
          );
  
          _setAutomatedMarketMakerPair(pair, value);
      }
  
      function _setAutomatedMarketMakerPair(address pair, bool value) private {
          automatedMarketMakerPairs[pair] = value;
  
          emit SetAutomatedMarketMakerPair(pair, value);
      }
  
      function updateRevShareWallet(address newRevShareWallet)
          external
          onlyOwner
      {
          emit revShareWalletUpdated(newRevShareWallet, revShareWallet);
          revShareWallet = newRevShareWallet;
      }
  
      function updatetreasuryWallet(address newWallet) external onlyOwner {
          emit treasuryWalletUpdated(newWallet, treasuryWallet);
          treasuryWallet = newWallet;
      }
  
      function isExcludedFromFees(address account) public view returns (bool) {
          return _isExcludedFromFees[account];
      }
  
      function isBlacklisted(address account) public view returns (bool) {
          return blacklisted[account];
      }
  
      function _transfer(
          address from,
          address to,
          uint256 amount
      ) internal override {
          require(from != address(0), "ERC20: transfer from the zero address");
          require(to != address(0), "ERC20: transfer to the zero address");
          require(!blacklisted[from], "Sender blacklisted");
          require(!blacklisted[to], "Receiver blacklisted");
  
          if (preMigrationPhase) {
              require(
                  preMigrationTransferrable[from],
                  "Not authorized to transfer pre-migration."
              );
          }
  
          if (amount == 0) {
              super._transfer(from, to, 0);
              return;
          }
  
          if (limitsInEffect) {
              if (
                  from != owner() &&
                  to != owner() &&
                  to != address(0) &&
                  to != address(0xdead) &&
                  !swapping
              ) {
                  if (!tradingActive) {
                      require(
                          _isExcludedFromFees[from] || _isExcludedFromFees[to],
                          "Trading is not active."
                      );
                  }
  
                  //when buy
                  if (
                      automatedMarketMakerPairs[from] &&
                      !_isExcludedMaxTransactionAmount[to]
                  ) {
                      require(
                          amount <= maxTransactionAmount,
                          "Buy transfer amount exceeds the maxTransactionAmount."
                      );
                      require(
                          amount + balanceOf(to) <= maxWallet,
                          "Max wallet exceeded"
                      );
                  }
                  //when sell
                  else if (
                      automatedMarketMakerPairs[to] &&
                      !_isExcludedMaxTransactionAmount[from]
                  ) {
                      require(
                          amount <= maxTransactionAmount,
                          "Sell transfer amount exceeds the maxTransactionAmount."
                      );
                  } else if (!_isExcludedMaxTransactionAmount[to]) {
                      require(
                          amount + balanceOf(to) <= maxWallet,
                          "Max wallet exceeded"
                      );
                  }
              }
          }
  
          uint256 contractTokenBalance = balanceOf(address(this));
  
          bool canSwap = contractTokenBalance >= swapTokensAtAmount;
  
          if (
              canSwap &&
              swapEnabled &&
              !swapping &&
              !automatedMarketMakerPairs[from] &&
              !_isExcludedFromFees[from] &&
              !_isExcludedFromFees[to]
          ) {
              swapping = true;
  
              swapBack();
  
              swapping = false;
          }
  
          bool takeFee = !swapping;
  
          // if any account belongs to _isExcludedFromFee account then remove the fee
          if (_isExcludedFromFees[from] || _isExcludedFromFees[to]) {
              takeFee = false;
          }
  
          uint256 fees = 0;
          // only take fees on buys/sells, do not take on wallet transfers
          if (takeFee) {
              // on sell
              if (automatedMarketMakerPairs[to] && sellTotalFees > 0) {
                  fees = amount.mul(sellTotalFees).div(100);
                  tokensForLiquidity += (fees * sellLiquidityFee) / sellTotalFees;
                  tokensForTreasury += (fees * sellTreasuryFee) / sellTotalFees;
                  tokensForRevShare += (fees * sellRevShareFee) / sellTotalFees;
              }
              // on buy
              else if (automatedMarketMakerPairs[from] && buyTotalFees > 0) {
                  fees = amount.mul(buyTotalFees).div(100);
                  tokensForLiquidity += (fees * buyLiquidityFee) / buyTotalFees;
                  tokensForTreasury += (fees * buyTreasuryFee) / buyTotalFees;
                  tokensForRevShare += (fees * buyRevShareFee) / buyTotalFees;
              }
  
              if (fees > 0) {
                  super._transfer(from, address(this), fees);
              }
  
              amount -= fees;
          }
  
          super._transfer(from, to, amount);
      }
  
      function swapTokensForEth(uint256 tokenAmount) private {
          // generate the uniswap pair path of token -> weth
          address[] memory path = new address[](2);
          path[0] = address(this);
          path[1] = uniswapV2Router.WETH();
  
          _approve(address(this), address(uniswapV2Router), tokenAmount);
  
          // make the swap
          uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
              tokenAmount,
              0, // accept any amount of ETH
              path,
              address(this),
              block.timestamp
          );
      }
  
      function addLiquidity(uint256 tokenAmount, uint256 ethAmount) private {
          // approve token transfer to cover all possible scenarios
          _approve(address(this), address(uniswapV2Router), tokenAmount);
  
          // add the liquidity
          uniswapV2Router.addLiquidityETH{value: ethAmount}(
              address(this),
              tokenAmount,
              0, // slippage is unavoidable
              0, // slippage is unavoidable
              owner(),
              block.timestamp
          );
      }
  
      function swapBack() private {
          uint256 contractBalance = balanceOf(address(this));
          uint256 totalTokensToSwap = tokensForLiquidity +
              tokensForRevShare +
              tokensForTreasury;
          bool success;
  
          if (contractBalance == 0 || totalTokensToSwap == 0) {
              return;
          }
  
          if (contractBalance > swapTokensAtAmount * 20) {
              contractBalance = swapTokensAtAmount * 20;
          }
  
          // Halve the amount of liquidity tokens
          uint256 liquidityTokens = (contractBalance * tokensForLiquidity) /
              totalTokensToSwap /
              2;
          uint256 amountToSwapForETH = contractBalance.sub(liquidityTokens);
  
          uint256 initialETHBalance = address(this).balance;
  
          swapTokensForEth(amountToSwapForETH);
  
          uint256 ethBalance = address(this).balance.sub(initialETHBalance);
  
          uint256 ethForRevShare = ethBalance.mul(tokensForRevShare).div(
              totalTokensToSwap - (tokensForLiquidity / 2)
          );
  
          uint256 ethForTreasury = ethBalance.mul(tokensForTreasury).div(
              totalTokensToSwap - (tokensForLiquidity / 2)
          );
  
          uint256 ethForLiquidity = ethBalance - ethForRevShare - ethForTreasury;
  
          tokensForLiquidity = 0;
          tokensForRevShare = 0;
          tokensForTreasury = 0;
  
          (success, ) = address(treasuryWallet).call{value: ethForTreasury}("");
  
          if (liquidityTokens > 0 && ethForLiquidity > 0) {
              addLiquidity(liquidityTokens, ethForLiquidity);
              emit SwapAndLiquify(
                  amountToSwapForETH,
                  ethForLiquidity,
                  tokensForLiquidity
              );
          }
  
          (success, ) = address(revShareWallet).call{
              value: address(this).balance
          }("");
      }
  
      function withdrawStuckKatana() external onlyOwner {
          uint256 balance = IERC20(address(this)).balanceOf(address(this));
          IERC20(address(this)).transfer(msg.sender, balance);
          payable(msg.sender).transfer(address(this).balance);
      }
  
      function withdrawStuckToken(address _token, address _to)
          external
          onlyOwner
      {
          require(_token != address(0), "_token address cannot be 0");
          uint256 _contractBalance = IERC20(_token).balanceOf(address(this));
          IERC20(_token).transfer(_to, _contractBalance);
      }
  
      function withdrawStuckEth(address toAddr) external onlyOwner {
          (bool success, ) = toAddr.call{value: address(this).balance}("");
          require(success);
      }
  
      // @dev treasury renounce blacklist commands
      function renounceBlacklist() public onlyOwner {
          blacklistRenounced = true;
      }
  
      function blacklist(address _addr) public onlyOwner {
          require(!blacklistRenounced, "Treasury has revoked blacklist rights");
          require(
              _addr != address(uniswapV2Pair) &&
                  _addr != address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D),
              "Cannot blacklist token's v2 router or v2 pool."
          );
          blacklisted[_addr] = true;
      }
  
      // @dev blacklist v3 pools; can unblacklist() down the road to suit project and community
      function blacklistLiquidityPool(address lpAddress) public onlyOwner {
          require(!blacklistRenounced, "Treasury has revoked blacklist rights");
          require(
              lpAddress != address(uniswapV2Pair) &&
                  lpAddress !=
                  address(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D),
              "Cannot blacklist token's v2 router or v2 pool."
          );
          blacklisted[lpAddress] = true;
      }
  
      // @dev unblacklist address; not affected by blacklistRenounced incase treasury wants to unblacklist v3 pools down the road
      function unblacklist(address _addr) public onlyOwner {
          blacklisted[_addr] = false;
      }
  
      function setPreMigrationTransferable(address _addr, bool isAuthorized)
          public
          onlyOwner
      {
          preMigrationTransferrable[_addr] = isAuthorized;
          excludeFromFees(_addr, isAuthorized);
          excludeFromMaxTransaction(_addr, isAuthorized);
      }
  }