Apply cargo clippy lints #108
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Cargo clippy told me that in a bunch of spots we did not need to pass in references as they would be immediately dereferenced anyways (https://rust-lang.github.io/rust-clippy/master/index.html#needless_borrow)
and that we could use try_fold() instead of fold() for handling the Option (https://rust-lang.github.io/rust-clippy/master/index.html#/manual_try_fold)