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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.
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This comment is hidden because it contains spoiler information about the solution
The problem is in your code, it is printing and returning, it prints
"***"
and returns3
it should only return"***"
In repl.it you see this:
***3
Read https://docs.codewars.com/training/troubleshooting#expected-the-same