Fix: Remove incorrect balance reset in claimReward function inside Self Destruct Forced Prevention Contract

[vedant-asati]

Description

In the Self Destruct Preventative Techniques section, the claimReward function contains a logical error where it sets balance = 0 before attempting to transfer funds. This causes the transfer to fail since it tries to send 0 ETH instead of the actual contract balance.

Current code:

function claimReward() public {
    require(msg.sender == winner, "Not winner");
    balance = 0;  // <-- Problem: Sets balance to 0 before transfer
    (bool sent,) = msg.sender.call{value: balance}("");  // Will always try to send 0 ETH
    require(sent, "Failed to send Ether");
}

Proposed fix:

function claimReward() public {
    require(msg.sender == winner, "Not winner");
    uint256 amount = balance;
    balance = 0;
    (bool sent,) = msg.sender.call{value: amount}("");
    require(sent, "Failed to send Ether");
}

Why this change is necessary

• The current implementation prevents winners from claiming their reward since it tries to transfer 0 ETH
• The fix ensures the proper amount is transferred before resetting the balance
• This aligns with the intended behavior of the game where winners should receive their reward