// SPDX-License-Identifier: MIT
    pragma solidity 0.8.17;

    interface IERC20 {
        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);
        }

    interface IERC20Metadata is IERC20 {
        function name() external view returns (string memory);
        function symbol() external view returns (string memory);
        function decimals() external view returns (uint8);
        }

    abstract contract Context {
        function _msgSender() internal view virtual returns (address) {
        return msg.sender;
        }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
        }
        }

    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 totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
        }

    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
        }

    function transfer(address recipient, uint256 amount) public virtual override returns (bool) {
        _transfer(_msgSender(), recipient, 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) {
        _approve(_msgSender(), spender, amount);
        return true;
        }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
        ) public virtual override returns (bool) {
        uint256 currentAllowance = _allowances[sender][_msgSender()];
        if (currentAllowance != type(uint256).max) {
        require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance");
        unchecked {
        _approve(sender, _msgSender(), currentAllowance - amount);
        }
        }
        _transfer(sender, recipient, 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 _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 _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 _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
        ) internal virtual {}

    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
        ) internal virtual {}
        }

    contract Tipfee is ERC20 {
        constructor () ERC20("Tipfee", "TPF") 
        {    
        _mint(msg.sender, 12_000_000_000_000 * (10 ** 18));
        }
        }