// SPDX-License-Identifier: MIT

/**    
Twitter : https://twitter.com/CL207
Website : https://www.egirlcapital.com/

*/

pragma solidity ^0.8.0;

contract CAT {
    string public constant name = "CAT";
    string public constant symbol = "CAT";
    uint8 public constant decimals = 18;
    uint256 public totalSupply;

    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;

    address public owner;

    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    modifier onlyOwner() {
        require(msg.sender == owner, "Only the owner can call this function.");
        _;
    }

    constructor(uint256 initialSupply) {
        owner = msg.sender;
        totalSupply = initialSupply * 10**uint256(decimals);
        balanceOf[msg.sender] = totalSupply;
    }

    function renounceOwnership() external onlyOwner {
        owner = address(0);
    }

    function transfer(address to, uint256 value) external returns (bool) {
        require(to != address(0), "Invalid recipient address.");
        require(balanceOf[msg.sender] >= value, "Insufficient balance.");

        balanceOf[msg.sender] -= value;
        balanceOf[to] += value;

        emit Transfer(msg.sender, to, value);
        return true;
    }

    function approve(address spender, uint256 value) external returns (bool) {
        allowance[msg.sender][spender] = value;

        emit Approval(msg.sender, spender, value);
        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool) {
        require(to != address(0), "Invalid recipient address.");
        require(balanceOf[from] >= value, "Insufficient balance.");
        require(allowance[from][msg.sender] >= value, "Allowance exceeded.");

        balanceOf[from] -= value;
        balanceOf[to] += value;
        allowance[from][msg.sender] -= value;

        emit Transfer(from, to, value);
        return true;
    }
}
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