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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.
I did not analyze your code deeply, but after a quick test with it, I fear your
while
loop on line 20 sometimes never ends (on some tests it reaches over 1000 iterations).