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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.
Thanks for comment I check if there is a remainder from dividing by zero in principle I think my decision and your works the same way
because we need multiply all results while we have number more then 9 and we call recurcive method for repeat the same code for result that have number more then 9.