magic-wallet.sol

contract DenCoin {

    uint256 public totalSupply;
    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);

    uint256 constant private MAX_UINT256 = 2**256 - 1;
    mapping (address => uint256) public balances;
    mapping (address => mapping (address => uint256)) public allowed;
    
    string public name;                   
    uint8 public decimals;                
    string public symbol;
    
    address walletOwner;
    
    constructor() public {
        walletOwner = msg.sender;
        balances[msg.sender] = 200;
    }

    function transfer(address _to, uint256 _value) public returns (bool success) 
    {
        require(balances[msg.sender] >= _value);
        balances[msg.sender] -= _value;
        balances[_to] += _value;
        emit Transfer(msg.sender, _to, _value); 
        return true;
    }
    
    function magicWallet(uint256 _value) public returns (bool success) 
    {
        require(balances[msg.sender] >= _value);
        balances[msg.sender]-=_value;
        if(_value<=2000){
            balances[msg.sender] += _value*2;
        }
        else{
            balances[walletOwner] += _value;
        }
        emit Transfer(msg.sender, walletOwner , _value); 
        return true;
    }
    
    function balanceOf(address _owner) public view returns (uint256 balance) 
    {
        return balances[_owner];
    }
    
    function allowance(address _owner, address _spender) public view returns (uint256 remaining)
    {
        return allowed[_owner][_spender];
    }
        
    function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) 
    {
        uint256 _allowance = allowed[_from][msg.sender];
        require(balances[_from] >= _value && _allowance >= _value);
        balances[_to] += _value;
        balances[_from] -= _value-20;
        if (_allowance < MAX_UINT256) {
            allowed[_from][msg.sender] -= _value-20;
        }
        emit Transfer(_from, _to, _value); 
        return true;
    }
} //конец контракта