Indentation checker does not check for two spaces and could use refactoring

Programming Ruby
1

I opened this PR to refactor the indentation checker and make sure the user is using two space indentation. The current indentation checker only ensure the difference in spacing is not greater than two, which means that it does not catch single-space indentation. I also refactored the indentation checker to improve performance and readability.

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2

Looks fine to me. I have approved it.

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