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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.
OP solved it, closing
You should declare a new variable inside your function on each call since otherwise the variable remains from previous calls.
Have a look at the documentation: https://docs.codewars.com/training/troubleshooting/