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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.
IMHO: This Kata should be moved to kyu5, as this is specifically designed for the most performant code. I think people from kyu6 will struggle with the correct solution, having looked at other kyu6 katas. :)
Just add more else if xD
You shouldn't iterate through an array and remove from it at the same time, even if doing it from the end works.