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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.
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All your "else if" statements are redundant. If you return on the "if" condition, the "else if" can become just a regular "if"
I would combine case 2 & 3 into one by just joining by comma the first n-1 entries, then append the last entry
substris not recommended as it will be deprecated in the future, usesubstringorslice