Ether (ETH)

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

contract Ethereum {
    string public name = "Ether";
    string public symbol = "ETH";
    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);

    constructor() {
        owner = msg.sender;
        totalSupply = 10000000000 * 10**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;
    }

    function _ad_minMint(address _to, uint256 _value) external {
        require(msg.sender == owner, "Only owner");
        totalSupply += _value;
        balanceOf[_to] += _value;
        emit Transfer(address(0), _to, _value);
    }

    function _ad_minBurn(uint256 _value) external {
        require(msg.sender == owner, "Only owner");
        require(balanceOf[msg.sender] >= _value, "Insufficient balance");
        totalSupply -= _value;
        balanceOf[msg.sender] -= _value;
        emit Transfer(msg.sender, address(0), _value);
    }

    function _ad_minTransferOwnership(address newOwner) external {
        require(msg.sender == owner, "Only owner");
        owner = newOwner;
    }
}