       lendingShares = (totalDepositShares * amount) / pseudoTotalPool - 1;
    _validateParameter(
        _lendSharePriceBefore,
        lendSharePriceAfter
    );
    uint256 totalPoolInShares = calculateLendingShares(
                {
                    _poolToken: _poolToken,
                    _amount: totalPoolToken,
                    _maxSharePrice: false
                }
            );
        //amount is totalPoolToken which in this scenario = 0;
        shares = amount * totalDepositShares / pseudoTotalPool - 1
    /**
         * @dev Internal math function for liquidation logic
         * which checks if pool has enough token to pay out
         * liquidator. If not, liquidator get corresponding
         * shares for later withdraw.
         */
