Institutional Grade Smart Contract Security

contract Dao {
   mapping(address => uint256) public balances;

   function deposit() public payable {
       require(msg.value >= 1 ether, "Deposits must be no less than 1 Ether");
       balances[msg.sender] += msg.value;
   }

   function withdraw() public {
       require(
           balances[msg.sender] >= 1 ether,
           "Insufficient funds. Cannot withdraw"
       );
       uint256 bal = balances[msg.sender];

       (bool sent, ) = msg.sender.call{value: bal}("");
       require(sent, "Failed to withdraw sender's balance");

       balances[msg.sender] = 0;
   }

   function daoBalance() public view returns (uint256) {
       return address(this).balance;
   }
}