Rust

refactor calculate_hashes #165

Job	Run time
build	27s
linting	21s
cross-testing (stable, ubuntu-latest, default)	28s
cross-testing (stable, ubuntu-latest, with-serde)	21s
cross-testing (stable, windows-latest, default)	1m 11s
cross-testing (stable, windows-latest, with-serde)	2m 0s
cross-testing (stable, macos-latest, default)	39s
cross-testing (stable, macos-latest, with-serde)	24s
cross-testing (nightly, ubuntu-latest, default)	20s
cross-testing (nightly, ubuntu-latest, with-serde)	14s
cross-testing (nightly, windows-latest, default)	1m 15s
cross-testing (nightly, windows-latest, with-serde)	36s
cross-testing (nightly, macos-latest, default)	29s
cross-testing (nightly, macos-latest, with-serde)	24s
cross-testing (1.41, ubuntu-latest, default)	22s
cross-testing (1.41, ubuntu-latest, with-serde)	25s
cross-testing (1.41, windows-latest, default)	1m 15s
cross-testing (1.41, windows-latest, with-serde)	1m 8s
cross-testing (1.41, macos-latest, default)	38s
cross-testing (1.41, macos-latest, with-serde)	24s
	13m 21s

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