All of the functions in the GeneralVault require 0x0 when referring to Ether, not the constant here. Having it here will lead to mistakes down the line. Its only used by CurveswapAdapter, so it only needs to be there (it currently is also defined there).
There is 1 instance of this issue:
https://github.com/code-423n4/2022-05-sturdy/blob/78f51a7a74ebe8adfd055bdbaedfddc05632566f/smart-contracts/GeneralVault.sol#L47
