UberToken ERC-20, lost 1 ETH forever

gistfile1.txt

pragma solidity 0.4.13;

contract UberToken {
    
    string public constant name = "IC3 2017 bootcamp UberToken";
    string public constant symbol = "UT3";
    uint8 public constant decimals = 18;

    uint256 public total_supply;
    mapping(address => uint256) public balances;
    
    function UberToken() {
        total_supply = 0;
    }
    
    function totalSupply() constant returns (uint256 totalSupply) {
        return total_supply;
    }
    
    function balanceOf(address _owner) constant returns (uint256 balance) {
        return balances[_owner];
    }

    function transfer(address _to, uint _value) returns (bool success) {
        if (balances[msg.sender] < _value) return false;
        balances[msg.sender] -= _value;
        balances[_to] += _value;
        return true;
    }
    
    function depost() payable returns (bool success) {
        if (msg.value < 1) return false;
        balances[msg.sender] += 1;
        total_supply += 1;
        return true;
    }
    
    function withdraw(uint256 amount) returns (bool success) {
        if (balances[msg.sender] < amount) return false;
        balances[msg.sender] -= amount;
        total_supply -= amount;
        if (!msg.sender.send(amount)) {
            balances[msg.sender] += amount;
            total_supply += amount;
            return false;
        }
        return true;
    }
}