R-CMD-check

replce `file_name` with `filename` #8

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Run time

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Job	Run time
macos-latest (release)	1m 53s
windows-latest (release)	4m 24s
ubuntu-latest (devel)	8m 9s
ubuntu-latest (release)	2m 48s
ubuntu-latest (oldrel-1)	2m 48s
	20m 2s