WINTG CFA

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract WCFA {
    string public name = "WINTG CFA";
    string public symbol = "WCFA";
    uint8 public decimals = 18;
    uint256 public totalSupply;
    address public owner;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    constructor() { owner = msg.sender; }

    function mint(address to, uint256 amt) external {
        require(msg.sender == owner, "!owner");
        totalSupply += amt;
        balanceOf[to] += amt;
        emit Transfer(address(0), to, amt);
    }
    function transfer(address to, uint256 amt) external returns (bool) { _t(msg.sender, to, amt); return true; }
    function approve(address s, uint256 amt) external returns (bool) {
        allowance[msg.sender][s] = amt; emit Approval(msg.sender, s, amt); return true;
    }
    function transferFrom(address f, address to, uint256 amt) external returns (bool) {
        uint256 a = allowance[f][msg.sender];
        require(a >= amt, "allow");
        if (a != type(uint256).max) allowance[f][msg.sender] = a - amt;
        _t(f, to, amt); return true;
    }
    function _t(address f, address to, uint256 amt) internal {
        require(balanceOf[f] >= amt, "bal");
        balanceOf[f] -= amt; balanceOf[to] += amt; emit Transfer(f, to, amt);
    }
}

contract TestToken {
    string public name;
    string public symbol;
    uint8 public decimals = 18;
    uint256 public totalSupply;
    address public owner;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    constructor(string memory n, string memory s, uint256 supply) {
        name = n; symbol = s; owner = msg.sender;
        totalSupply = supply; balanceOf[msg.sender] = supply;
        emit Transfer(address(0), msg.sender, supply);
    }
    function mint(address to, uint256 amt) external {
        require(msg.sender == owner, "!owner");
        totalSupply += amt; balanceOf[to] += amt; emit Transfer(address(0), to, amt);
    }
    function transfer(address to, uint256 amt) external returns (bool) { _t(msg.sender, to, amt); return true; }
    function approve(address sp, uint256 amt) external returns (bool) {
        allowance[msg.sender][sp] = amt; emit Approval(msg.sender, sp, amt); return true;
    }
    function transferFrom(address f, address to, uint256 amt) external returns (bool) {
        uint256 a = allowance[f][msg.sender]; require(a >= amt, "allow");
        if (a != type(uint256).max) allowance[f][msg.sender] = a - amt;
        _t(f, to, amt); return true;
    }
    function _t(address f, address to, uint256 amt) internal {
        require(balanceOf[f] >= amt, "bal");
        balanceOf[f] -= amt; balanceOf[to] += amt; emit Transfer(f, to, amt);
    }
}

contract TestNFT {
    string public name;
    string public symbol;
    uint256 public totalSupply;
    address public owner;
    mapping(uint256 => address) public ownerOf;
    mapping(address => uint256) public balanceOf;
    mapping(uint256 => address) public getApproved;
    event Transfer(address indexed from, address indexed to, uint256 indexed id);
    event Approval(address indexed owner, address indexed approved, uint256 indexed id);

    constructor(string memory n, string memory s) { name = n; symbol = s; owner = msg.sender; }
    function mint(address to) external returns (uint256 id) {
        id = ++totalSupply; ownerOf[id] = to; balanceOf[to]++; emit Transfer(address(0), to, id);
    }
    function transferFrom(address from, address to, uint256 id) external {
        require(ownerOf[id] == from, "own");
        require(msg.sender == from || getApproved[id] == msg.sender, "auth");
        ownerOf[id] = to; balanceOf[from]--; balanceOf[to]++; delete getApproved[id];
        emit Transfer(from, to, id);
    }
    function approve(address a, uint256 id) external {
        require(ownerOf[id] == msg.sender, "own"); getApproved[id] = a; emit Approval(msg.sender, a, id);
    }
}

interface IERC20 {
    function transfer(address to, uint256 amount) external returns (bool);
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
    function balanceOf(address) external view returns (uint256);
}

contract GasBurner {
    uint256 public acc;
    function churn(uint256 rounds) external {
        uint256 a = acc;

        assembly {
            for { let i := 0 } lt(i, rounds) { i := add(i, 1) } {
                mstore(0x00, a)
                mstore(0x20, i)
                a := keccak256(0x00, 0x40)
            }
        }
        acc = a;
    }
}

contract WtgPool {
    IERC20 public quote;
    address public owner;
    event Swap(address indexed who, bool wtgIn, uint256 amountIn, uint256 amountOut);

    constructor(address _quote) { quote = IERC20(_quote); owner = msg.sender; }

    function getReserves() external view returns (uint256 wtgReserve, uint256 quoteReserve) {
        return (address(this).balance, quote.balanceOf(address(this)));
    }

    function addLiquidity(uint256 quoteAmount) external payable {
        require(quote.transferFrom(msg.sender, address(this), quoteAmount), "quote in");
    }

    function _out(uint256 amountIn, uint256 rIn, uint256 rOut) internal pure returns (uint256) {
        uint256 inWithFee = amountIn * 997;
        return (inWithFee * rOut) / (rIn * 1000 + inWithFee);
    }

    function swapWtgForQuote(uint256 minOut) external payable returns (uint256 out) {
        uint256 rWtg = address(this).balance - msg.value;
        uint256 rQuote = quote.balanceOf(address(this));
        out = _out(msg.value, rWtg, rQuote);
        require(out >= minOut && out < rQuote, "slip");
        require(quote.transfer(msg.sender, out), "quote out");
        emit Swap(msg.sender, true, msg.value, out);
    }

    function swapQuoteForWtg(uint256 amountIn, uint256 minOut) external returns (uint256 out) {
        require(quote.transferFrom(msg.sender, address(this), amountIn), "quote in");
        uint256 rQuote = quote.balanceOf(address(this)) - amountIn;
        uint256 rWtg = address(this).balance;
        out = _out(amountIn, rQuote, rWtg);
        require(out >= minOut && out < rWtg, "slip");
        (bool ok, ) = msg.sender.call{value: out}("");
        require(ok, "wtg out");
        emit Swap(msg.sender, false, amountIn, out);
    }

    receive() external payable {}
}

[
    {
        "inputs": [],
        "stateMutability": "nonpayable",
        "type": "constructor"
    },
    {
        "anonymous": false,
        "inputs": [
            {
                "indexed": true,
                "internalType": "address",
                "name": "owner",
                "type": "address"
            },
            {
                "indexed": true,
                "internalType": "address",
                "name": "spender",
                "type": "address"
            },
            {
                "indexed": false,
                "internalType": "uint256",
                "name": "value",
                "type": "uint256"
            }
        ],
        "name": "Approval",
        "type": "event"
    },
    {
        "anonymous": false,
        "inputs": [
            {
                "indexed": true,
                "internalType": "address",
                "name": "from",
                "type": "address"
            },
            {
                "indexed": true,
                "internalType": "address",
                "name": "to",
                "type": "address"
            },
            {
                "indexed": false,
                "internalType": "uint256",
                "name": "value",
                "type": "uint256"
            }
        ],
        "name": "Transfer",
        "type": "event"
    },
    {
        "inputs": [
            {
                "internalType": "address",
                "name": "",
                "type": "address"
            },
            {
                "internalType": "address",
                "name": "",
                "type": "address"
            }
        ],
        "name": "allowance",
        "outputs": [
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    },
    {
        "inputs": [
            {
                "internalType": "address",
                "name": "s",
                "type": "address"
            },
            {
                "internalType": "uint256",
                "name": "amt",
                "type": "uint256"
            }
        ],
        "name": "approve",
        "outputs": [
            {
                "internalType": "bool",
                "name": "",
                "type": "bool"
            }
        ],
        "stateMutability": "nonpayable",
        "type": "function"
    },
    {
        "inputs": [
            {
                "internalType": "address",
                "name": "",
                "type": "address"
            }
        ],
        "name": "balanceOf",
        "outputs": [
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    },
    {
        "inputs": [],
        "name": "decimals",
        "outputs": [
            {
                "internalType": "uint8",
                "name": "",
                "type": "uint8"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    },
    {
        "inputs": [
            {
                "internalType": "address",
                "name": "to",
                "type": "address"
            },
            {
                "internalType": "uint256",
                "name": "amt",
                "type": "uint256"
            }
        ],
        "name": "mint",
        "outputs": [],
        "stateMutability": "nonpayable",
        "type": "function"
    },
    {
        "inputs": [],
        "name": "name",
        "outputs": [
            {
                "internalType": "string",
                "name": "",
                "type": "string"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    },
    {
        "inputs": [],
        "name": "owner",
        "outputs": [
            {
                "internalType": "address",
                "name": "",
                "type": "address"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    },
    {
        "inputs": [],
        "name": "symbol",
        "outputs": [
            {
                "internalType": "string",
                "name": "",
                "type": "string"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    },
    {
        "inputs": [],
        "name": "totalSupply",
        "outputs": [
            {
                "internalType": "uint256",
                "name": "",
                "type": "uint256"
            }
        ],
        "stateMutability": "view",
        "type": "function"
    },
    {
        "inputs": [
            {
                "internalType": "address",
                "name": "to",
                "type": "address"
            },
            {
                "internalType": "uint256",
                "name": "amt",
                "type": "uint256"
            }
        ],
        "name": "transfer",
        "outputs": [
            {
                "internalType": "bool",
                "name": "",
                "type": "bool"
            }
        ],
        "stateMutability": "nonpayable",
        "type": "function"
    },
    {
        "inputs": [
            {
                "internalType": "address",
                "name": "f",
                "type": "address"
            },
            {
                "internalType": "address",
                "name": "to",
                "type": "address"
            },
            {
                "internalType": "uint256",
                "name": "amt",
                "type": "uint256"
            }
        ],
        "name": "transferFrom",
        "outputs": [
            {
                "internalType": "bool",
                "name": "",
                "type": "bool"
            }
        ],
        "stateMutability": "nonpayable",
        "type": "function"
    }
]

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