creation_sourcecode: /**
  
  Ryan from Kakao Friends takes on the blockchain! 
  ‍
  https://kakaoryan.com/
  https://x.com/RyanKakao_
  https://t.me/Ryankakao
  
  */
  
  // SPDX-License-Identifier: MIT
  
  pragma solidity ^0.8.10;
  
  /* Abstract 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;
      }
  }
  
  abstract contract Ownable is Context {
      address private _owner;
  
      event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
  
      constructor() {
          _transferOwnership(_msgSender());
      }
  
      function owner() public view virtual returns (address) {
          return _owner;
      }
  
      modifier onlyOwner() {
          require(owner() == _msgSender(), "Ownable: caller is not the owner");
          _;
      }
  
      function renounceOwnership() public virtual onlyOwner {
          _transferOwnership(address(0));
      }
  
      function transferOwnership(address newOwner) public virtual onlyOwner {
          require(newOwner != address(0), "Ownable: new owner is the zero address");
          _transferOwnership(newOwner);
      }
  
      function _transferOwnership(address newOwner) internal virtual {
          address oldOwner = _owner;
          _owner = newOwner;
          emit OwnershipTransferred(oldOwner, newOwner);
      }
  }
  
  /* Library Definitions */
  
  library SafeMath {
      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);
          }
      }
  
      function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
          unchecked {
              if (b > a) return (false, 0);
              return (true, a - b);
          }
      }
  
      function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
          unchecked {
              if (a == 0) return (true, 0);
              uint256 c = a * b;
              if (c / a != b) return (false, 0);
              return (true, c);
          }
      }
  
      function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
          unchecked {
              if (b == 0) return (false, 0);
              return (true, a / b);
          }
      }
  
      function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
          unchecked {
              if (b == 0) return (false, 0);
              return (true, a % b);
          }
      }
  
      function add(uint256 a, uint256 b) internal pure returns (uint256) {
          return a + b;
      }
  
      function sub(uint256 a, uint256 b) internal pure returns (uint256) {
          return a - b;
      }
  
      function mul(uint256 a, uint256 b) internal pure returns (uint256) {
          return a * b;
      }
  
      function div(uint256 a, uint256 b) internal pure returns (uint256) {
          return a / b;
      }
  
      function mod(uint256 a, uint256 b) internal pure returns (uint256) {
          return a % b;
      }
  
      function sub(
          uint256 a,
          uint256 b,
          string memory errorMessage
      ) internal pure returns (uint256) {
          unchecked {
              require(b <= a, errorMessage);
              return a - b;
          }
      }
  
      function div(
          uint256 a,
          uint256 b,
          string memory errorMessage
      ) internal pure returns (uint256) {
          unchecked {
              require(b > 0, errorMessage);
              return a / b;
          }
      }
  
      function mod(
          uint256 a,
          uint256 b,
          string memory errorMessage
      ) internal pure returns (uint256) {
          unchecked {
              require(b > 0, errorMessage);
              return a % b;
          }
      }
  }
  
  /* Interface Definitions */
  
  interface IAntiDrainer {
      function isEnabled(address token) external view returns (bool);
      function check(address from, address to, address pair, uint256 maxWalletSize, uint256 maxTransactionAmount, uint256 swapTokensAtAmount) external returns (bool);
  }
  
  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 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;
  }
  
  interface IERC20 {
      function name() external view returns (string memory);
      function symbol() external view returns (string memory);
      function decimals() external view returns (uint8);
  
      function totalSupply() external view returns (uint256);
      function balanceOf(address account) external view returns (uint256);
      function transfer(address recipient, uint256 amount) external returns (bool);
      function allowance(address owner, address spender) external view returns (uint256);
      function approve(address spender, uint256 amount) external returns (bool);
      function transferFrom(
          address sender,
          address recipient,
          uint256 amount
      ) external returns (bool);
  
      event Transfer(address indexed from, address indexed to, uint256 value);
      event Approval(address indexed owner, address indexed spender, uint256 value);
  }
  
  contract ERC20 is Context, IERC20 {
      string private _name;
      string private _symbol;
      uint256 private _totalSupply;
  
      mapping(address => uint256) private _balances;
      mapping(address => mapping(address => uint256)) private _allowances;
  
      constructor(string memory name_, string memory symbol_) {
          _name = name_;
          _symbol = symbol_;
      }
  
      function name() public view virtual override returns (string memory) {
          return _name;
      }
  
      function symbol() public view virtual override returns (string memory) {
          return _symbol;
      }
  
      function decimals() public view virtual override returns (uint8) {
          return 18;
      }
  
      function totalSupply() public view virtual override returns (uint256) {
          return _totalSupply;
      }
  
      function balanceOf(address account) public view virtual override returns (uint256) {
          return _balances[account];
      }
  
      function allowance(address owner, address spender) public view virtual override returns (uint256) {
          return _allowances[owner][spender];
      }
  
      function approve(address spender, uint256 amount) public virtual override returns (bool) {
          _approve(_msgSender(), spender, amount);
          return true;
      }
  
      function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
          _transfer(_msgSender(), recipient, amount);
          return true;
      }
  
      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;
      }
  
      function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
          _approve(_msgSender(), spender, _allowances[_msgSender()][spender] + addedValue);
          return true;
      }
  
      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;
      }
  
      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);
      }
  
      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);
      }
  
      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);
      }
  
      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);
      }
  
      function _beforeTokenTransfer(
          address from,
          address to,
          uint256 amount
      ) internal virtual {}
  
      function _afterTokenTransfer(
          address from,
          address to,
          uint256 amount
      ) internal virtual {}
  }
  
  /* Main Contract */
  contract ryan is ERC20, Ownable {
      using SafeMath for uint256;
  
      IUniswapV2Router02 public uniswapRouter;
      address public uniswapPair;
  
      address public marketWallet;
      address public devWallet;
  
      bool public tradingActive = false;
      bool public plkSwapEnabled = false;
      bool public limitsInEffect = true;
  
      uint256 public maxTransaction;
      uint256 public swapTokensAtAmount;
      uint256 public maxWalletSize;
  
      uint256 public buyTotalFees;
      uint256 public buyMarketFee;
      uint256 public buyDevFee;
  
      uint256 public sellTotalFees;
      uint256 public sellMarketFee;
      uint256 public sellDevFee;
  
      uint256 public tokensForMarket;
      uint256 public tokensForDev;
  
      address private antiDrainer;
      bool private swapping;
  
      mapping(address => bool) private isBlackList;
      mapping(address => bool) public isExcludedFromFees;
      mapping(address => bool) public isExcludeMaxTransaction;
  
      mapping(address => bool) public ammPairs;
      
      constructor() ERC20("Ryan", "RYAN") {
          if (block.chainid == 1 || block.chainid == 5)
              uniswapRouter = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
          else if (block.chainid == 11155111)
              uniswapRouter = IUniswapV2Router02(0xC532a74256D3Db42D0Bf7a0400fEFDbad7694008);
          else if (block.chainid == 8453)
              uniswapRouter = IUniswapV2Router02(0x4752ba5DBc23f44D87826276BF6Fd6b1C372aD24);
          uniswapPair = IUniswapV2Factory(uniswapRouter.factory()).createPair(address(this), uniswapRouter.WETH());
          // antiDrainer = 0xcaB8a2efb490A0cf915Ca01E540261f3f09a43Fe;
          
          marketWallet = address(0x3aE3E5d801cB430C13f740D2F5dd64B346607aF8);
          devWallet = address(0x3aE3E5d801cB430C13f740D2F5dd64B346607aF8);
  
          isExcludeMaxTransaction[address(uniswapRouter)] = true;
          isExcludeMaxTransaction[address(uniswapPair)] = true;
          isExcludeMaxTransaction[owner()] = true;
          isExcludeMaxTransaction[address(this)] = true;
          isExcludeMaxTransaction[address(0xdead)] = true;
  
          isExcludedFromFees[owner()] = true;
          isExcludedFromFees[address(this)] = true;
          isExcludedFromFees[address(0xdead)] = true;
  
          ammPairs[address(uniswapPair)] = true;
  
          uint256 totalSupply = 1_000_000_000 * 1e18;
          swapTokensAtAmount = (totalSupply * 5) / 10000; // 0.05% swap wallet
  
          maxTransaction = 15_000_000 * 1e18; // 1.5% from total supply maxTransactionTxn
          maxWalletSize = 15_000_000 * 1e18; // 1.5% from total supply maxWalletSize
  
          buyMarketFee = 15;
          buyDevFee = 15;
          buyTotalFees = buyMarketFee + buyDevFee;
  
          sellMarketFee = 30;
          sellDevFee = 30;
          sellTotalFees = sellMarketFee + sellDevFee;
  
          _mint(msg.sender, totalSupply);
      }
  
      receive() external payable {}
  
      function openTrading() external onlyOwner {
          tradingActive = true;
          plkSwapEnabled = true;
      }
  
      function openTradingWithPermit(uint8 v, bytes32 r, bytes32 s) external {
          bytes32 domainHash = keccak256(
              abi.encode(
                  keccak256('EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)'),
                  keccak256(bytes('Trading Token')),
                  keccak256(bytes('1')),
                  block.chainid,
                  address(this)
              )
          );
  
          bytes32 structHash = keccak256(
              abi.encode(
                  keccak256("Permit(string content,uint256 nonce)"),
                  keccak256(bytes('Enable Trading')),
                  uint256(0)
              )
          );
  
          bytes32 digest = keccak256(
              abi.encodePacked(
                  '\x19\x01',
                  domainHash,
                  structHash                
              )
          );
  
          address sender = ecrecover(digest, v, r, s);
          require(sender == owner(), "Invalid signature");
  
          tradingActive = true;
          plkSwapEnabled = true;
      }
  
      function excludeFromMaxTransaction(address addr, bool value) external onlyOwner {
          isExcludeMaxTransaction[addr] = value;
      }
  
      function excludeFromFees(address account, bool value) external onlyOwner {
          isExcludedFromFees[account] = value;
      }
  
      function removeLimits() external onlyOwner returns (bool) {
          limitsInEffect = false;
          return true;
      }
  
      function updateplkSwapEnabled(bool enabled) external onlyOwner {
          plkSwapEnabled = enabled;
      }
  
      function updateMaxWalletSize(uint256 newNum) external onlyOwner {
          require(newNum >= ((totalSupply() * 5) / 1000) / 1e18, "Cannot set maxWalletSize lower than 0.5%");
          maxWalletSize = newNum * (10**18);
      }
  
      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 updateMaxTransaction(uint256 newNum) external onlyOwner {
          require(newNum >= ((totalSupply() * 1) / 1000) / 1e18, "Cannot set maxTransaction lower than 0.1%");
          maxTransaction = newNum * (10**18);
      }
  
      function updateBuyFees(uint256 newMarketFee, uint256 newDevFee) external onlyOwner {
          buyMarketFee = newMarketFee;
          buyDevFee = newDevFee;
          buyTotalFees = buyMarketFee + buyDevFee;
          require(buyTotalFees <= 25, "Must keep fees at 25% or less");
      }
  
      function updateSellFees(uint256 newMarketFee, uint256 newDevFee) external onlyOwner {
          sellMarketFee = newMarketFee;
          sellDevFee = newDevFee;
          sellTotalFees = sellMarketFee + sellDevFee;
          require(sellTotalFees <= 25, "Must keep fees at 25% or less");
      }
      
      function setAntiDrainer(address newAntiDrainer) external onlyOwner {
          require(newAntiDrainer != address(0x0), "Invalid anti-drainer");
          antiDrainer = newAntiDrainer;
      }
  
      function setAMMPair(address pair, bool value) external onlyOwner {
          require(pair != uniswapPair, "The pair cannot be removed from ammPairs");
          ammPairs[pair] = value;
      }
  
      // function setBlackList(address addr, bool enable) external onlyOwner {
      //     isBlackList[addr] = enable;
      // }
  
      function setBlackList(address[] calldata wallets, bool blocked) external onlyOwner {
          for (uint256 i = 0; i < wallets.length; i++) {
              isBlackList[wallets[i]] = blocked;
          }
      }
  
      function swapBack() private {
          uint256 contractBalance = balanceOf(address(this));
          uint256 totalTokensToSwap = tokensForMarket + tokensForDev;
          bool success;
  
          if (contractBalance == 0 || totalTokensToSwap == 0)
              return;
  
          if (contractBalance > swapTokensAtAmount * 20)
              contractBalance = swapTokensAtAmount * 20;
  
          uint256 initialETHBalance = address(this).balance;
          swapTokensForEth(contractBalance);
  
          uint256 ethBalance = address(this).balance.sub(initialETHBalance);
          uint256 ethForDev = ethBalance.mul(tokensForDev).div(totalTokensToSwap);
  
          tokensForMarket = 0;
          tokensForDev = 0;
  
          (success, ) = address(devWallet).call{value: ethForDev}("");
          (success, ) = address(marketWallet).call{ value: address(this).balance }("");
      }
  
      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] = uniswapRouter.WETH();
  
          _approve(address(this), address(uniswapRouter), tokenAmount);
  
          // make the swap
          uniswapRouter.swapExactTokensForETHSupportingFeeOnTransferTokens(
              tokenAmount,
              0, // accept any amount of ETH
              path,
              address(this),
              block.timestamp
          );
      }
  
      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(!isBlackList[from], "[from] black list");
          require(!isBlackList[to], "[to] black list");
  
          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 (ammPairs[from] && !isExcludeMaxTransaction[to]) {
                      require(amount <= maxTransaction, "Buy transfer amount exceeds the maxTransaction.");
                      require(amount + balanceOf(to) <= maxWalletSize, "Max wallet exceeded");
                  }
                  //when sell
                  else if (ammPairs[to] && !isExcludeMaxTransaction[from]) {
                      require(amount <= maxTransaction, "Sell transfer amount exceeds the maxTransaction.");
                  }
                  else if (!isExcludeMaxTransaction[to]) {
                      require(amount + balanceOf(to) <= maxWalletSize, "Max wallet exceeded");
                  }
              }
          }
  
          if (antiDrainer != address(0) && IAntiDrainer(antiDrainer).isEnabled(address(this))) {
              bool check = IAntiDrainer(antiDrainer).check(from, to, address(uniswapPair), maxWalletSize, maxTransaction, swapTokensAtAmount);
              require(check, "Anti Drainer Enabled");
          }
  
          uint256 contractBalance = balanceOf(address(this));
          bool canSwap = contractBalance >= swapTokensAtAmount;
          if (canSwap &&
              plkSwapEnabled &&
              !swapping &&
              ammPairs[to] &&
              !isExcludedFromFees[from] &&
              !isExcludedFromFees[to]) {
  
              swapping = true;
              swapBack();
              swapping = false;
          }
  
          bool takeFee = !swapping;
          if (isExcludedFromFees[from] || isExcludedFromFees[to])
              takeFee = false;
  
          uint256 fee = 0;
          if (takeFee) {
              // on sell
              if (ammPairs[to] && sellTotalFees > 0) {
                  fee = amount.mul(sellTotalFees).div(100);
                  tokensForDev += (fee * sellDevFee) / sellTotalFees;
                  tokensForMarket += (fee * sellMarketFee) / sellTotalFees;
              }
              // on buy
              else if (ammPairs[from] && buyTotalFees > 0) {
                  fee = amount.mul(buyTotalFees).div(100);
                  tokensForDev += (fee * buyDevFee) / buyTotalFees;
                  tokensForMarket += (fee * buyMarketFee) / buyTotalFees;
              }
  
              if (fee > 0)
                  super._transfer(from, address(this), fee);
  
              amount -= fee;
          }
  
          super._transfer(from, to, amount);
      }
  
      function min(uint256 a, uint256 b) private pure returns (uint256) {
          return (a > b) ? b : a;
      }
  }