fix clippy warnings on assert_eq with boolean

[perlindgren]

Fixed warnings like this:

assert_eq!(is_lower_camel_case("abc"), true);

->

assert!(is_lower_camel_case("abc"));

Alternatively a clippy allow could of course be considered.

[dalance]

I can merge the first commit dec2a56.
Or do you plan to change this PR to implementation of bit witdh check?

[perlindgren]

You can merge as is, the width check will come later.

[dalance]

You can merge as is, the width check will come later.

OK. so could you revert other changes except dec2a56 ?
If I merge this PR as is, unexpected println will be merged too.