    function bringUnusedETHBackIntoGiantPool(
        address[] calldata _savETHVaults,
        LPToken[][] calldata _lpTokens,
        uint256[][] calldata _amounts
    ) external {
        uint256 numOfVaults = _savETHVaults.length;
        require(numOfVaults > 0, "Empty arrays");
        require(numOfVaults == _lpTokens.length, "Inconsistent arrays");
        require(numOfVaults == _amounts.length, "Inconsistent arrays");
        for (uint256 i; i < numOfVaults; ++i) {
            SavETHVault vault = SavETHVault(_savETHVaults[i]);
            for (uint256 j; j < _lpTokens[i].length; ++j) {
                require(
                    vault.isDETHReadyForWithdrawal(address(_lpTokens[i][j])) == false,
                    "ETH is either staked or derivatives minted"
                );
            }
            vault.burnLPTokens(_lpTokens[i], _amounts[i]);
        }
    }
    function burnLPToken(LPToken _lpToken, uint256 _amount) public nonReentrant returns (uint256) {
        /// .....
        (bool result,) = msg.sender.call{value: _amount}("");
        // .....
    }
