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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Thanks, added one more test as You suggest.
I agree with you, but I think that my version has a right to exist
Thanks, added one more test, correct description
Thank you very much for your advice and for correcting my sloppy English)
I agree that it is wrong to allow non-numeric characters and removed it from the tests. I also changed the name of the function a bit, but still left the input and output parameters as strings. I think it will help improve the skills of working with strings.