remove unused functions #24

Job	Run time
build (ubuntu-latest, lts-18.28)	4m 7s
build (ubuntu-latest, lts-19.33)	4m 52s
build (ubuntu-latest, lts-20.26)	4m 26s
build (ubuntu-latest, lts-21.25)	4m 41s
build (ubuntu-latest, lts-22.18)	4m 52s
build (ubuntu-latest, nightly)	5m 0s
build (macOS-latest, lts-20.26)	5m 5s
build (macOS-latest, lts-21.25)	5m 28s
build (macOS-latest, lts-22.18)	6m 33s
build (macOS-latest, nightly)	5m 20s
build (windows-latest, lts-18.28)	9m 8s
build (windows-latest, lts-19.33)	9m 20s
build (windows-latest, lts-20.26)	9m 0s
build (windows-latest, lts-21.25)	8m 53s
build (windows-latest, lts-22.18)	8m 25s
build (windows-latest, nightly)	11m 35s
	1h 46m 45s

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