clippy fixes

[ognevny]

I used clippy with very pedantic lints (including absolutely useless lints) which gave some hints about making code more idiomatic

cargo clippy command

cargo clippy --all -- \
          -W clippy::all \
          -W clippy::pedantic \
          -W clippy::restriction \
          -W clippy::nursery \
          -W clippy::cargo \
          -A clippy::modulo_arithmetic \
          -A clippy::arithmetic_side_effects \
          -A clippy::missing_inline_in_public_items \
          -A clippy::implicit_return \
          -A clippy::default_numeric_fallback \
          -A clippy::std_instead_of_core \
          -A clippy::module_name_repetitions \
          -A clippy::question_mark_used \
          -A clippy::integer_division \
          -A clippy::shadow_reuse \
          -A clippy::single_call_fn \
          -A clippy::indexing_slicing \
          -A clippy::blanket_clippy_restriction_lints \
          -A clippy::missing_docs_in_private_items \
          -A clippy::std-instead-of-alloc \
          -A clippy::self_named_module_files \
          -A clippy::unseparated_literal_suffix \
          -A clippy::pub_use \
          -A clippy::partial_pub_fields \
          -A clippy::missing_trait_methods \
          -A clippy::float_arithmetic \
          -A clippy::cast_precision_loss \
          -A clippy::as_conversions \
          -A clippy::cast_possible_truncation \
          -A clippy::pattern_type_mismatch \
          -A clippy::integer_division_remainder_used \
          -A clippy::multiple-crate-versions || true

[dalance]

Thanks!
I'll merge this PR.