OnlyFrens.sol

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

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 MyToken is IERC20 {
    string public name = "OnlyFrens";
    string public symbol = "FREN";
    uint8 public decimals = 18;
    uint256 public totalSupply = 6969696969696 * 10**uint256(decimals);
    mapping(address => uint256) public balances;
    mapping(address => mapping(address => uint256)) public allowed;

    constructor() {
        balances[msg.sender] = totalSupply;
        emit Transfer(address(0), msg.sender, totalSupply);
    }

    function balanceOf(address account) external view override returns (uint256) {
        return balances[account];
    }

    function transfer(address recipient, uint256 amount) external override returns (bool) {
        require(amount <= balances[msg.sender], "Insufficient balance");
        balances[msg.sender] -= amount;
        balances[recipient] += amount;
        emit Transfer(msg.sender, recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) external view override returns (uint256) {
        return allowed[owner][spender];
    }

    function approve(address spender, uint256 amount) external override returns (bool) {
        allowed[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) external override returns (bool) {
        require(amount <= balances[sender], "Insufficient balance");
        require(amount <= allowed[sender][msg.sender], "Insufficient allowance");
        balances[sender] -= amount;
        balances[recipient] += amount;
        allowed[sender][msg.sender] -= amount;
        emit Transfer(sender, recipient, amount);
        return true;
    }
}