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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.
What does your solution return locally for
maskify("123")
then?Your solution is incorrect. Did you try examples from description in VSC or browser console?