Fix Clippy errors and enable Clippy checks in CI #12

Job	Run time
Rustfmt	4s
Test (ubuntu-latest, 1.70)	23s
docs	12s
clippy	12s
Test (ubuntu-latest, stable)	25s
Test (ubuntu-latest, beta)	38s
Test (ubuntu-latest, nightly)	48s
Test (macos-latest, 1.70)	30s
Test (macos-latest, stable)	19s
Test (macos-latest, beta)	27s
Test (macos-latest, nightly)	26s
Test (windows-latest, 1.70)	1m 18s
Test (windows-latest, stable)	1m 24s
Test (windows-latest, beta)	1m 16s
Test (windows-latest, nightly)	54s
Test Cross Compile - aarch64-apple-ios	20s
Test Cross Compile - aarch64-unknown-linux-gnu	36s
Test Cross Compile - arm-unknown-linux-gnueabihf	57s
Test Cross Compile - powerpc-unknown-linux-gnu	39s
Test Cross Compile - s390x-unknown-linux-gnu	38s
Test Cross Compile - x86_64-unknown-linux-musl	55s
Test Cross Compile - aarch64-unknown-linux-musl	48s
Test Cross Compile - x86_64-pc-solaris	20s
Test Cross Compile - x86_64-pc-windows-gnu	1m 13s
Test Cross Compile - x86_64-unknown-netbsd	43s
Test Cross Compile - x86_64-unknown-illumos	35s
	17m 0s

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