function _requestWithdrawShares(uint256 shares) private {
    require(shares > 0, "WooSuperChargerVault: !amount");
    require(!isSettling, "WooSuperChargerVault: CANNOT_WITHDRAW_IN_SETTLING");
    require(requestUsers.length() <= maxWithdrawCount, "WooSuperChargerVault: MAX_WITHDRAW_COUNT");

    address owner = msg.sender;

    lendingManager.accureInterest();
    uint256 amount = _assets(shares);
    TransferHelper.safeTransferFrom(address(this), owner, address(this), shares);

    requestedWithdrawShares[owner] = requestedWithdrawShares[owner] + shares;
    requestedTotalShares = requestedTotalShares + shares;
    requestUsers.add(owner);

    emit RequestWithdraw(owner, amount, shares);
}

function endWeeklySettle() public onlyAdmin {
    require(isSettling, "!SETTLING");
    require(weeklyNeededAmountForWithdraw() == 0, "WEEKLY_REPAY_NOT_CLEARED");

    // NOTE: Do need accureInterest here, since it's already been updated in `startWeeklySettle`
    uint256 sharePrice = getPricePerFullShare();

    isSettling = false;
    uint256 totalWithdrawAmount = requestedTotalAmount();

    if (totalWithdrawAmount != 0) {
        uint256 shares = _sharesUp(totalWithdrawAmount, reserveVault.getPricePerFullShare());
        reserveVault.withdraw(shares);

        if (want == weth) {
            IWETH(weth).deposit{value: totalWithdrawAmount}();
        }
        require(available() >= totalWithdrawAmount);

        uint256 length = requestUsers.length();

        // @audit-issue DOS here if attacker performs lots of requests.
        for (uint256 i = 0; i < length; i++) {
            address user = requestUsers.at(0);

            withdrawManager.addWithdrawAmount(user, (requestedWithdrawShares[user] * sharePrice) / 1e18);

            requestedWithdrawShares[user] = 0;
            requestUsers.remove(user);
        }

        _burn(address(this), requestedTotalShares);
        requestedTotalShares = 0;

        TransferHelper.safeTransfer(want, address(withdrawManager), totalWithdrawAmount);
    }

    instantWithdrawnAmount = 0;

    lendingManager.accureInterest();
    uint256 totalBalance = balance();
    instantWithdrawCap = totalBalance / 10;

    emit WeeklySettleEnded(msg.sender, totalBalance, lendingBalance(), reserveBalance());
}