Fix clippy warnings

[Lireer]

While creating the other PRs I checked clippy and fixed the shown warnings. Some changes may have just been due to different styles, so feel free to change whatever you want or just close the PR.

If you don't mind I will probably try to reduce the number of clones/allocations being used.

[alexhallam]

this is the first time I have seen clamp.

[alexhallam]

I learned a lot from this.

[alexhallam]

Thanks. I was using rustfmt for linting. Could you let me know what the differences where between rustfmt and clippy?

[Lireer]

Thank you for being so fast with the reviews and merging. rustfmt just formats the code without checking the logic of the code, i.e. it even formats code the type checker would mark as incorrect. clippy is the official rust linter to check (some of) the logic in your code. It adds more lints than are already in the compiler. In my opinion it also teaches how to write better rust code and how to write "rustic" code, e.g. variable instead of return variable; as the final line of a function. I think it should already be installed if you installed rust using rustup.

[alexhallam]

Thanks for the explanations and thanks for the fantastic contributions.