R Under development (unstable) (2026-01-21 r89314 ucrt) -- "Unsuffered Consequences"
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Platform: x86_64-w64-mingw32/x64

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> library(ribiosUtils)
> 
> stopifnot(identical(extname("mybook.pdf"), "pdf"))
> stopifnot(identical(extname("sequence.in.fasta"), "fasta"))
> stopifnot(identical(extname(c("/path/mybook.pdf", "test.doc")),
+                     c("pdf", "doc")))
>                             
> stopifnot(identical(extname("README"), NA))
> stopifnot(identical(extname("/path/my\ home/Holiday Plan.txt"), "txt"))
> 
> proc.time()
   user  system elapsed 
   0.14    0.03    0.15