fix format errors in C as noted by CRAN #33

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Run time

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Job	Run time
macos-latest (release)	4m 2s
macos-latest (release)	4m 2s
windows-latest (release)	6m 26s
windows-latest (release)	6m 26s
ubuntu-latest (devel)	17m 56s
ubuntu-latest (devel)	18m 49s
ubuntu-latest (release)	3m 9s
ubuntu-latest (release)	3m 9s
ubuntu-latest (oldrel-1)	3m 15s
ubuntu-latest (oldrel-1)	3m 15s
	1h 10m 29s