wallet].password = _new;
    }

    function deposit(uint _wallet) public payable {
        wallets[_wallet].balance += msg.value;
    }

    function withdraw(uint _wallet, bytes32 _password, uint _value) public {
        require(wallets[_wallet].password == _password);
        require(wallets[_wallet].balance >= _value);
        msg.sender.transfer(_value);
    }
}
</code>
</pre>
