creation_sourcecode: /**
  t.me/yellowbillcoin
  */
  
  // SPDX-License-Identifier: MIT
  pragma solidity ^0.8.24;
  
  interface IERC20 {
      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.
       *
       * 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
      );
  }
  
  /**
   * @dev Wrappers over Solidity's arithmetic operations with added overflow
   * checks.
   *
   * Arithmetic operations in Solidity wrap on overflow. This can easily result
   * in bugs, because programmers usually assume that an overflow raises an
   * error, which is the standard behavior in high level programming languages.
   * `SafeMath` restores this intuition by reverting the transaction when an
   * operation overflows.
   *
   * Using this library instead of the unchecked operations eliminates an entire
   * class of bugs, so it's recommended to use it always.
   */
  
  library SafeMath {
      /**
       * @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) {
          uint256 c = a + b;
          require(c >= a, "SafeMath: addition overflow");
  
          return c;
      }
  
      /**
       * @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 sub(a, b, "SafeMath: subtraction overflow");
      }
  
      /**
       * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
       * overflow (when the result is negative).
       *
       * Counterpart to Solidity's `-` operator.
       *
       * Requirements:
       *
       * - Subtraction cannot overflow.
       */
      function sub(
          uint256 a,
          uint256 b,
          string memory errorMessage
      ) internal pure returns (uint256) {
          require(b <= a, errorMessage);
          uint256 c = a - b;
  
          return c;
      }
  
      /**
       * @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) {
  
          if (a == 0) {
              return 0;
          }
  
          uint256 c = a * b;
          require(c / a == b, "SafeMath: multiplication overflow");
  
          return c;
      }
  
      /**
       * @dev Returns the integer division of two unsigned integers. Reverts on
       * division by zero. The result is rounded towards zero.
       *
       * Requirements:
       *
       * - The divisor cannot be zero.
       */
      function div(uint256 a, uint256 b) internal pure returns (uint256) {
          return div(a, b, "SafeMath: division by zero");
      }
  
      /**
       * @dev Returns the integer division of two unsigned integers. Reverts 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) {
          require(b > 0, errorMessage);
          uint256 c = a / b;
          // assert(a == b * c + a % b); // There is no case in which this doesn't hold
  
          return c;
      }
  
      /**
       * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
       * Reverts 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 mod(a, b, "SafeMath: modulo by zero");
      }
  
      /**
       * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
       * Reverts with custom message 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,
          string memory errorMessage
      ) internal pure returns (uint256) {
          require(b != 0, errorMessage);
          return a % b;
      }
  }
  
  abstract contract Context {
      function _msgSender() internal view virtual returns (address payable) {
          return payable(msg.sender);
      }
  
      function _msgData() internal view virtual returns (bytes memory) {
          this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
          return msg.data;
      }
  }
  
  /**
   * @dev Collection of functions related to the address type
   */
  library Address {
      /**
       * @dev Returns true if `account` is a contract.
       *
       * [IMPORTANT]
       * ====
       * It is unsafe to assume that an address for which this function returns
       * false is an externally-owned account (EOA) and not a contract.
       *
       * Among others, `isContract` will return false for the following
       * types of addresses:
       *
       *  - an externally-owned account
       *  - a contract in construction
       *  - an address where a contract will be created
       *  - an address where a contract lived, but was destroyed
       * ====
       */
      function isContract(address account) internal view returns (bool) {
          // According to EIP-1052, 0x0 is the value returned for not-yet created accounts
          // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned
          // for accounts without code, i.e. `keccak256('')`
          bytes32 codehash;
          bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
          // solhint-disable-next-line no-inline-assembly
          assembly {
              codehash := extcodehash(account)
          }
          return (codehash != accountHash && codehash != 0x0);
      }
  
      /**
       * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
       * `recipient`, forwarding all available gas and reverting on errors.
       */
      function sendValue(address payable recipient, uint256 amount) internal {
          require(
              address(this).balance >= amount,
              "Address: insufficient balance"
          );
  
          // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
          (bool success, ) = recipient.call{value: amount}("");
          require(
              success,
              "Address: unable to send value, recipient may have reverted"
          );
      }
  
      /**
       * @dev Performs a Solidity function call using a low level `call`. A
       * plain`call` is an unsafe replacement for a function call: use this
       * function instead.
       *
       * If `target` reverts with a revert reason, it is bubbled up by this
       * function (like regular Solidity function calls).
       *
       * Returns the raw returned data. To convert to the expected return value,
       * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
       *
       * Requirements:
       *
       * - `target` must be a contract.
       * - calling `target` with `data` must not revert.
       *
       * _Available since v3.1._
       */
      function functionCall(address target, bytes memory data)
          internal
          returns (bytes memory)
      {
          return functionCall(target, data, "Address: low-level call failed");
      }
  
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
       * `errorMessage` as a fallback revert reason when `target` reverts.
       *
       * _Available since v3.1._
       */
      function functionCall(
          address target,
          bytes memory data,
          string memory errorMessage
      ) internal returns (bytes memory) {
          return _functionCallWithValue(target, data, 0, errorMessage);
      }
  
      /**
       * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
       * but also transferring `value` wei to `target`.
       *
       * Requirements:
       *
       * - the calling contract must have an ETH balance of at least `value`.
       * - the called Solidity function must be `payable`.
       *
       * _Available since v3.1._
       */
      function functionCallWithValue(
          address target,
          bytes memory data,
          uint256 value
      ) internal returns (bytes memory) {
          return
              functionCallWithValue(
                  target,
                  data,
                  value,
                  "Address: low-level call with value failed"
              );
      }
  
      /**
       * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
       * with `errorMessage` as a fallback revert reason when `target` reverts.
       *
       * _Available since v3.1._
       */
      function functionCallWithValue(
          address target,
          bytes memory data,
          uint256 value,
          string memory errorMessage
      ) internal returns (bytes memory) {
          require(
              address(this).balance >= value,
              "Address: insufficient balance for call"
          );
          return _functionCallWithValue(target, data, value, errorMessage);
      }
  
      function _functionCallWithValue(
          address target,
          bytes memory data,
          uint256 weiValue,
          string memory errorMessage
      ) private returns (bytes memory) {
          require(isContract(target), "Address: call to non-contract");
  
          // solhint-disable-next-line avoid-low-level-calls
          (bool success, bytes memory returndata) = target.call{value: weiValue}(
              data
          );
          if (success) {
              return returndata;
          } else {
              // Look for revert reason and bubble it up if present
              if (returndata.length > 0) {
                  // The easiest way to bubble the revert reason is using memory via assembly
  
                  // solhint-disable-next-line no-inline-assembly
                  assembly {
                      let returndata_size := mload(returndata)
                      revert(add(32, returndata), returndata_size)
                  }
              } else {
                  revert(errorMessage);
              }
          }
      }
  }
  
  /**
   * @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.
   */
  contract Ownable is Context {
      address private _owner;
      address private _previousOwner;
  
  
      event OwnershipTransferred(
          address indexed previousOwner,
          address indexed newOwner
      );
  
      /**
       * @dev Initializes the contract setting the deployer as the initial owner.
       */
      constructor() {
          address msgSender = _msgSender();
          _owner = msgSender;
          emit OwnershipTransferred(address(0), msgSender);
      }
  
      /**
       * @dev Returns the address of the current owner.
       */
      function owner() public view 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 {
          emit OwnershipTransferred(_owner, address(0));
          _owner = address(0);
      }
  
  
  }
  
  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;
  }
  
  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 IUniswapV2Router01 {
      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 removeLiquidity(
          address tokenA,
          address tokenB,
          uint256 liquidity,
          uint256 amountAMin,
          uint256 amountBMin,
          address to,
          uint256 deadline
      ) external returns (uint256 amountA, uint256 amountB);
  
      function removeLiquidityETH(
          address token,
          uint256 liquidity,
          uint256 amountTokenMin,
          uint256 amountETHMin,
          address to,
          uint256 deadline
      ) external returns (uint256 amountToken, uint256 amountETH);
  
      function removeLiquidityWithPermit(
          address tokenA,
          address tokenB,
          uint256 liquidity,
          uint256 amountAMin,
          uint256 amountBMin,
          address to,
          uint256 deadline,
          bool approveMax,
          uint8 v,
          bytes32 r,
          bytes32 s
      ) external returns (uint256 amountA, uint256 amountB);
  
      function removeLiquidityETHWithPermit(
          address token,
          uint256 liquidity,
          uint256 amountTokenMin,
          uint256 amountETHMin,
          address to,
          uint256 deadline,
          bool approveMax,
          uint8 v,
          bytes32 r,
          bytes32 s
      ) external returns (uint256 amountToken, uint256 amountETH);
  
      function swapExactTokensForTokens(
          uint256 amountIn,
          uint256 amountOutMin,
          address[] calldata path,
          address to,
          uint256 deadline
      ) external returns (uint256[] memory amounts);
  
      function swapTokensForExactTokens(
          uint256 amountOut,
          uint256 amountInMax,
          address[] calldata path,
          address to,
          uint256 deadline
      ) external returns (uint256[] memory amounts);
  
      function swapExactETHForTokens(
          uint256 amountOutMin,
          address[] calldata path,
          address to,
          uint256 deadline
      ) external payable returns (uint256[] memory amounts);
  
      function swapTokensForExactETH(
          uint256 amountOut,
          uint256 amountInMax,
          address[] calldata path,
          address to,
          uint256 deadline
      ) external returns (uint256[] memory amounts);
  
      function swapExactTokensForETH(
          uint256 amountIn,
          uint256 amountOutMin,
          address[] calldata path,
          address to,
          uint256 deadline
      ) external returns (uint256[] memory amounts);
  
      function swapETHForExactTokens(
          uint256 amountOut,
          address[] calldata path,
          address to,
          uint256 deadline
      ) external payable returns (uint256[] memory amounts);
  
      function quote(
          uint256 amountA,
          uint256 reserveA,
          uint256 reserveB
      ) external pure returns (uint256 amountB);
  
      function getAmountOut(
          uint256 amountIn,
          uint256 reserveIn,
          uint256 reserveOut
      ) external pure returns (uint256 amountOut);
  
      function getAmountIn(
          uint256 amountOut,
          uint256 reserveIn,
          uint256 reserveOut
      ) external pure returns (uint256 amountIn);
  
      function getAmountsOut(uint256 amountIn, address[] calldata path)
          external
          view
          returns (uint256[] memory amounts);
  
      function getAmountsIn(uint256 amountOut, address[] calldata path)
          external
          view
          returns (uint256[] memory amounts);
  }
  
  interface IUniswapV2Router02 is IUniswapV2Router01 {
      function removeLiquidityETHSupportingFeeOnTransferTokens(
          address token,
          uint256 liquidity,
          uint256 amountTokenMin,
          uint256 amountETHMin,
          address to,
          uint256 deadline
      ) external returns (uint256 amountETH);
  
      function removeLiquidityETHWithPermitSupportingFeeOnTransferTokens(
          address token,
          uint256 liquidity,
          uint256 amountTokenMin,
          uint256 amountETHMin,
          address to,
          uint256 deadline,
          bool approveMax,
          uint8 v,
          bytes32 r,
          bytes32 s
      ) external returns (uint256 amountETH);
  
      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 YELLOWBILLCOIN is Context, IERC20, Ownable {
      using SafeMath for uint256;
      using Address for address;
  
      mapping(address => uint256) private _rOwned;
      mapping(address => mapping(address => uint256)) private _allowances;
  
      mapping(address => bool) private _isExcludedFromFee;
  
      mapping(address => bool) private _isExcludedFromLimit;
  
      uint256 private _tTotal = 1000000 * 10**18;
  
      address payable private _marketingAddress = payable(address(0x5Ab9BD7A4EE3D1cbD976E4c1Fc894Aa7F836022b));
  
      string private _name = "YELLOWBILLCOIN";
      string private _symbol = "BILL";
      uint8 private _decimals = 18;
  
      struct BuyFee {
          uint8 liquidity;
          uint8 marketing;
      }
  
      struct SellFee {
          uint8 liquidity;
          uint8 marketing;
      }
  
      BuyFee public buyFee;
      SellFee public sellFee;
  
      uint8 private _liquidityFee;
      uint8 private _marketingFee;
  
      IUniswapV2Router02 public immutable uniswapV2Router;
      address public immutable uniswapV2Pair;
  
      bool inSwapAndLiquify;
      bool public swapAndLiquifyEnabled = true;
  
      uint256 private _maxTxAmount = _tTotal.div(1000).mul(20); // 2%
      uint256 private numTokensSellToAddToLiquidity = _tTotal.div(1000).mul(3); //0.3%
      uint256 private _maxWalletSize = _tTotal.div(1000).mul(20); // 2%
  
      event MinTokensBeforeSwapUpdated(uint256 minTokensBeforeSwap);
      event SwapAndLiquifyEnabledUpdated(bool enabled);
      event SwapAndLiquify(
          uint256 tokensSwapped,
          uint256 ethReceived,
          uint256 tokensIntoLiqudity
      );
  
      modifier lockTheSwap() {
          inSwapAndLiquify = true;
          _;
          inSwapAndLiquify = false;
      }
  
      bool tradingOpen = false;
  
      mapping (address => uint256) _lastTrade;
  
      constructor() {
          _rOwned[_msgSender()] = _tTotal;
  
          buyFee.liquidity = 5;
          buyFee.marketing = 10;
  
          sellFee.liquidity = 5;
          sellFee.marketing = 10;
  
          IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
          // Create a uniswap pair for this new token
          uniswapV2Pair = IUniswapV2Factory(_uniswapV2Router.factory()).createPair(address(this), _uniswapV2Router.WETH());
  
          // set the rest of the contract variables
          uniswapV2Router = _uniswapV2Router;
  
          // exclude owner, and this contract from fee
          _isExcludedFromFee[owner()] = true;
          _isExcludedFromFee[address(this)] = true;
          _isExcludedFromFee[_marketingAddress] = true;
  
          _isExcludedFromLimit[_marketingAddress] = true;
          _isExcludedFromLimit[owner()] = true;
          _isExcludedFromLimit[address(this)] = true;
  
          emit Transfer(address(0), _msgSender(), _tTotal);
      }
  
      function name() public view returns (string memory) {
          return _name;
      }
  
      function symbol() public view returns (string memory) {
          return _symbol;
      }
  
      function decimals() public view returns (uint8) {
          return _decimals;
      }
  
      function totalSupply() public view override returns (uint256) {
          return _tTotal;
      }
  
      function balanceOf(address account) public view override returns (uint256) {
          return _rOwned[account];
      }
  
      function transfer(address recipient, uint256 amount)
          public
          override
          returns (bool)
      {
          _transfer(_msgSender(), recipient, amount);
          return true;
      }
  
      function allowance(address owner, address spender)
          public
          view
          override
          returns (uint256)
      {
          return _allowances[owner][spender];
      }
  
      function approve(address spender, uint256 amount)
          public
          override
          returns (bool)
      {
          _approve(_msgSender(), spender, amount);
          return true;
      }
  
      function transferFrom(
          address sender,
          address recipient,
          uint256 amount
      ) public override returns (bool) {
          _transfer(sender, recipient, amount);
          _approve(
              sender,
              _msgSender(),
              _allowances[sender][_msgSender()].sub(
                  amount,
                  "ERC20: transfer amount exceeds allowance"
              )
          );
          return true;
      }
  
      function increaseAllowance(address spender, uint256 addedValue)
          public
          virtual
          returns (bool)
      {
          _approve(
              _msgSender(),
              spender,
              _allowances[_msgSender()][spender].add(addedValue)
          );
          return true;
      }
  
      function decreaseAllowance(address spender, uint256 subtractedValue)
          public
          virtual
          returns (bool)
      {
          _approve(
              _msgSender(),
              spender,
              _allowances[_msgSender()][spender].sub(
                  subtractedValue,
                  "ERC20: decreased allowance below zero"
              )
          );
          return true;
      }
  
  
      function reduceTax(
          uint8 buy_liquidity,
          uint8 buy_marketing,
          uint8 sell_liquidity,
          uint8 sell_marketing
  
      ) external onlyOwner {
          buyFee.marketing = buy_marketing;
          buyFee.liquidity = buy_liquidity;
  
          sellFee.marketing = sell_marketing;
          sellFee.liquidity = sell_liquidity;
      }
  
  
      //to recieve ETH from uniswapV2Router when swapping
      receive() external payable {}
  
      function _getTValues(uint256 tAmount)
          private
          view
          returns (
              uint256,
              uint256,
              uint256
          )
      {
          uint256 tLiquidity = calculateLiquidityFee(tAmount);
          uint256 tWallet = calculateMarketingFee(tAmount);
          uint256 tTransferAmount = tAmount.sub(tLiquidity).sub(tWallet);
  
          return (tTransferAmount, tLiquidity, tWallet);
      }
  
      function _takeLiquidity(uint256 tLiquidity) private {
          _rOwned[address(this)] = _rOwned[address(this)].add(tLiquidity);
      }
  
      function _takeWalletFee(uint256 tWallet) private {
          _rOwned[address(this)] = _rOwned[address(this)].add(tWallet);
      }
  
      function calculateLiquidityFee(uint256 _amount)
          private
          view
          returns (uint256)
      {
          return _amount.mul(_liquidityFee).div(10**2);
      }
  
      function calculateMarketingFee(uint256 _amount)
          private
          view
          returns (uint256)
      {
          return _amount.mul(_marketingFee).div(10**2);
      }
  
     
      function removeAllFee() private {
          _liquidityFee = 0;
          _marketingFee = 0;
       
      }
  
      function setBuy() private {
          _liquidityFee = buyFee.liquidity;
          _marketingFee = buyFee.marketing;
        
      }
  
      function setSell() private {
          _liquidityFee = sellFee.liquidity;
          _marketingFee = sellFee.marketing;
        
      }
  
  
  
      function _approve(
          address owner,
          address spender,
          uint256 amount
      ) private {
          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);
      }
  
      function _transfer(
          address from,
          address to,
          uint256 amount
      ) private {
          require(from != address(0), "ERC20: transfer from the zero address");
          require(to != address(0), "ERC20: transfer to the zero address");
          require(amount > 0, "Transfer amount must be greater than zero");
          
          if ( from != owner() && to != owner() ) require(tradingOpen, "Trading not yet enabled."); //transfers disabled before openTrading
  
          // is the token balance of this contract address over the min number of
          // tokens that we need to initiate a swap + liquidity lock?
          // also, don't get caught in a circular liquidity event.
          // also, don't swap & liquify if sender is uniswap pair.
          uint256 contractTokenBalance = balanceOf(address(this));
  
          if (contractTokenBalance >= _maxTxAmount) {
              contractTokenBalance = _maxTxAmount;
          }
  
          bool overMinTokenBalance = contractTokenBalance >=
              numTokensSellToAddToLiquidity;
          if (
              overMinTokenBalance &&
              !inSwapAndLiquify &&
              from != uniswapV2Pair &&
              swapAndLiquifyEnabled
          ) {
              contractTokenBalance = numTokensSellToAddToLiquidity;
              //add liquidity
              swapAndLiquify(contractTokenBalance);
          }
  
          //indicates if fee should be deducted from transfer
          bool takeFee = true;
  
          //if any account belongs to _isExcludedFromFee account then remove the fee
          if (_isExcludedFromFee[from] || _isExcludedFromFee[to]) {
              takeFee = false;
          }
          if (takeFee) {
              if (!_isExcludedFromLimit[from] && !_isExcludedFromLimit[to]) {
                  require(
                      amount <= _maxTxAmount,
                      "Transfer amount exceeds the maxTxAmount."
                  );
                  if (to != uniswapV2Pair) {
                      require(
                          amount + balanceOf(to) <= _maxWalletSize,
                          "Recipient exceeds max wallet size."
                      );
                  }
  
                
              }
          }
  
          //transfer amount, it will take liquidity fee
          _tokenTransfer(from, to, amount, takeFee);
      }
  
      function swapAndLiquify(uint256 tokens) private lockTheSwap {
          // Split the contract balance into halves
          uint256 denominator = (buyFee.liquidity + sellFee.liquidity + buyFee.marketing + sellFee.marketing) * 2;
          uint256 tokensToAddLiquidityWith = (tokens * (buyFee.liquidity + sellFee.liquidity)) / denominator;
          uint256 toSwap = tokens - tokensToAddLiquidityWith;
  
          uint256 initialBalance = address(this).balance;
  
          swapTokensForEth(toSwap);
  
          uint256 deltaBalance = address(this).balance - initialBalance;
          uint256 unitBalance = deltaBalance / (denominator - (buyFee.liquidity + sellFee.liquidity));
          uint256 ethToAddLiquidityWith = unitBalance * (buyFee.liquidity + sellFee.liquidity);
  
          if (ethToAddLiquidityWith > 0) {
              // Add liquidity to uniswap
              addLiquidity(tokensToAddLiquidityWith, ethToAddLiquidityWith);
          }
  
          // Send ETH to marketing
          uint256 marketingAmt = unitBalance * 2 * (buyFee.marketing + sellFee.marketing);
         
  
          if (marketingAmt > 0) {
              payable(_marketingAddress).transfer(marketingAmt);
          }
  
      
      }
  
      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
              address(this),
              block.timestamp
          );
      }
  
      //this method is responsible for taking all fee, if takeFee is true
      function _tokenTransfer(
          address sender,
          address recipient,
          uint256 amount,
          bool takeFee
      ) private {
          if (takeFee) {
              removeAllFee();
              if (sender == uniswapV2Pair) {
                  setBuy();
              }
              if (recipient == uniswapV2Pair) {
                  setSell();
              }
          }
  
          _transferStandard(sender, recipient, amount);
  
          removeAllFee();
      }
  
      function _transferStandard(
          address sender,
          address recipient,
          uint256 tAmount
      ) private {
          (
              uint256 tTransferAmount,
              uint256 tLiquidity,
              uint256 tWallet
          ) = _getTValues(tAmount);
  
          _rOwned[sender] = _rOwned[sender].sub(tAmount);
          _rOwned[recipient] = _rOwned[recipient].add(tTransferAmount);
          _takeLiquidity(tLiquidity);
          _takeWalletFee(tWallet);
          emit Transfer(sender, recipient, tTransferAmount);
      }
  
      function turnonTrading() external onlyOwner() {
      require(!tradingOpen, "Trading is already enabled");
      tradingOpen = true;
      }
  }