uniq: use helper function for file creation #1621

Job	Run time
Style/lint (ubuntu-latest, all, true)	2m 1s
Style/Python	7s
Style/lint (windows-latest, feat_os_windows)	4m 6s
Style/format (ubuntu-latest, feat_os_unix)	10s
Style/lint (macos-latest, feat_os_macos)	1m 59s
Style/spelling (ubuntu-latest, feat_os_unix)	18s
Pre-commit hooks	36s
Style/toml	4s
	9m 21s

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