add override and remove immutable in function to fit version under v0.8.8 #255
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contract's solidity version is solidity ^0.8.4, but in code use two feature only support ^0.8.8.
https://blog.soliditylang.org/2021/09/27/solidity-0.8.8-release-announcement/
you can see No Override for Interface Functions and Reading From Immutable Variables in this article.
so to fit contract version under 0.8.8, I add override for Interface function and remove read immutable variable in one mock contract.