Contract Source Code:

pragma solidity ^0.8.0;

contract Sonikku {
    uint256 public totalSupply = 50000000;
    string public name = "Sonikku";
    string public symbol = "SONIKKU";
    uint8 public decimals = 18;

    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
    );

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

    function transfer(address recipient, uint256 amount)
        external
        returns (bool)
    {
        balanceOf[msg.sender] -= amount;
        balanceOf[recipient] += amount;
        emit Transfer(msg.sender, recipient, amount);
        return true;
    }

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

    function transferFrom(address sender, address recipient, uint256 amount)
        external
        returns (bool)
    {
        allowance[sender][msg.sender] -= amount;
        balanceOf[sender] -= amount;
        balanceOf[recipient] += amount;
        emit Transfer(sender, recipient, amount);
        return true;
    }
}

Contract Source Code:

pragma solidity ^0.8.0;

contract Sonikku {
    uint256 public totalSupply = 50000000;
    string public name = "Sonikku";
    string public symbol = "SONIKKU";
    uint8 public decimals = 18;

    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
    );

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

    function transfer(address recipient, uint256 amount)
        external
        returns (bool)
    {
        balanceOf[msg.sender] -= amount;
        balanceOf[recipient] += amount;
        emit Transfer(msg.sender, recipient, amount);
        return true;
    }

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

    function transferFrom(address sender, address recipient, uint256 amount)
        external
        returns (bool)
    {
        allowance[sender][msg.sender] -= amount;
        balanceOf[sender] -= amount;
        balanceOf[recipient] += amount;
        emit Transfer(sender, recipient, amount);
        return true;
    }
}