if (address(_inputToken) == ETH) {
  require(address(this).balance >= _inputTokenAmount, "NF: INVALID_AMOUNT_IN");
  weth.deposit{ value: _inputTokenAmount }();
  return (IERC20(address(weth)), _inputTokenAmount);
}
receive() external payable {
  require(msg.sender == address(weth), "NF: ETH_SENDER_NOT_WETH");
}
if (address(_inputToken) == ETH) {
  require(!_fromReserve, "NF: INVALID_INPUT_TOKEN");
  require(address(this).balance >= _inputTokenAmount, "NF: INVALID_AMOUNT_IN");
  weth.deposit{ value: _inputTokenAmount }();
  return (IERC20(address(weth)), _inputTokenAmount);
}
