Make security audit on this smart contract code: contract DepositFunds { mapping(address => uint) public balances; function deposit() public payable { balances[msg.sender] += msg.value; } function withdraw() public { uint bal = balances[msg.sender]; require(bal > 0); (bool sent, ) = msg.sender.call{value: bal}(""); require(sent, "Failed to send Ether"); balances[msg.sender] = 0; } }

What common vulnerabilities are present in the following code:

Audit smart contract

Tell me if my code is secure