What common vulnerabilities are present in the following code:

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Prompt Starters

1. 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; } }
2. What common vulnerabilities are present in the following code:
3. Audit smart contract
4. Tell me if my code is secure