introduce the util_app function to avoid duplication #1425

Job	Run time
Style/Python	7s
Pre-commit hooks	37s
Style/format (ubuntu-latest, feat_os_unix)	22s
Style/toml	11s
Style/spelling (ubuntu-latest, feat_os_unix)	17s
Style/lint (ubuntu-latest, all, true)	2m 0s
Style/lint (windows-latest, feat_os_windows)	3m 6s
Style/lint (macos-latest, feat_os_macos)	1m 48s
	8m 28s

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