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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.
You are using a recursive solution (a method that calls itself). It says in the description that this will fail for large values, and the challenge is to solve the factorial problem without using recursion.
Compilation bugs. For example, before this soulution was accepted, I had to add
"print result" before return