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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.
Ruby 3.0 should be enabled (Refer this & this for more detail)
Python new test framework should be used (Refer this & this for more detail)
Not anymore, but it was due to your code mutating the input. Read this: https://docs.codewars.com/training/troubleshooting#works-but-no
Problems with random test. When try it manualy all works. Maybe some sort of mistake