Rust

refactor calculate_hashes #166

Job	Run time
build	20s
linting	20s
cross-testing (stable, ubuntu-latest, default)	16s
cross-testing (stable, ubuntu-latest, with-serde)	21s
cross-testing (stable, windows-latest, default)	1m 4s
cross-testing (stable, windows-latest, with-serde)	1m 4s
cross-testing (stable, macos-latest, default)	25s
cross-testing (stable, macos-latest, with-serde)	27s
cross-testing (nightly, ubuntu-latest, default)	13s
cross-testing (nightly, ubuntu-latest, with-serde)	20s
cross-testing (nightly, windows-latest, default)	1m 31s
cross-testing (nightly, windows-latest, with-serde)	1m 8s
cross-testing (nightly, macos-latest, default)	29s
cross-testing (nightly, macos-latest, with-serde)	24s
cross-testing (1.41, ubuntu-latest, default)	25s
cross-testing (1.41, ubuntu-latest, with-serde)	23s
cross-testing (1.41, windows-latest, default)	1m 8s
cross-testing (1.41, windows-latest, with-serde)	1m 23s
cross-testing (1.41, macos-latest, default)	35s
cross-testing (1.41, macos-latest, with-serde)	27s
	12m 43s

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