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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.
lazy boi
The current rating of this kata is 6 kyu and I don't think changing it is possible once it is published (unless a mod could do it).
Python version has been solved more than 500 times, so adding test cases is not possible.
Javascript version can be solved with a while loop too.
Why didn't you mark your post as a suggestion instead of an issue?