DVD Unstoppable #1 - a()

Deposit.sol

    // why use deposit tokens to get the balance?
    function depositTokens(uint256 amount) external nonReentrant {
        require(amount > 0, "Must deposit at least one token");
        // Transfer token from sender. Sender must have first approved them.
        damnValuableToken.transferFrom(msg.sender, address(this), amount);
        poolBalance = poolBalance + amount;
    }