Errors "KittyBridge__NothingToWithdraw" and "KittyBridge__FailedToWithdrawEth" inside of "KittyBridgeBase.sol" are not being used anywhere.
Errors "KittyBridge__NothingToWithdraw" and "KittyBridge__FailedToWithdrawEth" inside of "KittyBridgeBase.sol" are not being used anywhere, have to be removed for gas cost optimization.
Low.
Manual review.
Remove the errors for gas cost optimization.
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