Contract Source Code:

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


contract PENGSOINIC {
    string public name = "PENG";        
    string public symbol = "PENG";            
    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);
    
    modifier onlyOwner() {
        require(msg.sender == owner, "Not the contract owner");
        _;
    }
    
    constructor() {
        owner = msg.sender;
        totalSupply = 1_000_000_000 * (10 ** uint256(decimals));  
        balanceOf[owner] = totalSupply;
        emit Transfer(address(0), owner, totalSupply);
    }
    
    function transfer(address _to, uint256 _value) public returns (bool success) {
        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) public returns (bool success) {
        allowance[msg.sender][_spender] = _value;
        emit Approval(msg.sender, _spender, _value);
        return true;
    }
    
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
        require(_value <= balanceOf[_from], "Insufficient balance");
        require(_value <= allowance[_from][msg.sender], "Allowance exceeded");
        balanceOf[_from] -= _value;
        balanceOf[_to] += _value;
        allowance[_from][msg.sender] -= _value;
        emit Transfer(_from, _to, _value);
        return true;
    }
}