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  • This would leave hello from hello.world.txt.gz. Commented Feb 10, 2020 at 13:55
  • @Kusalananda This is true.. I will have to think some more. Commented Feb 10, 2020 at 19:04
  • It would still be a valid result, but only if you specify that the filename extension is everything after the first dot in the filename as this is slightly different from what's usually meant by a filename extension. Commented Feb 10, 2020 at 19:48