GETRICH (GTR)

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}

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);
}

contract GETRICH is Context, IERC20 {
    string public constant name = "GETRICH";
    string public constant symbol = "GTR";
    uint8 public constant decimals = 18;
uint256 private _totalSupply = 1_000_000_000 * 10 ** uint256(decimals);
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) private _allowances;

    constructor() {
        _balances[_msgSender()] = _totalSupply;
        emit Transfer(address(0), _msgSender(), _totalSupply);
    }

    function totalSupply() public view override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[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()] - amount);
return true;
    }

    function _transfer(address sender, address recipient, uint256 amount) internal {
        require(sender != address(0), "from zero address");
        require(recipient != address(0), "to zero address");
        require(_balances[sender] >= amount, "balance too low");

        uint256 burnAmount = amount / 100; // 1% queima
        uint256 sendAmount = amount - burnAmount;

        _balances[sender] -= amount;
        _balances[recipient] += sendAmount;
        _totalSupply -= burnAmount;

        emit Transfer(sender, recipient, sendAmount);
        emit Transfer(sender, address(0), burnAmount); // queima
    }

    function _approve(address owner, address spender, uint256 amount) internal {
        require(owner != address(0), "approve from zero");
        require(spender != address(0), "approve to zero");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }
}