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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.
Amazing!!!
Although the test wasnt made to catch exceptions, it would be nice to implement one to catch errors if the input contains something other than integers and a lenght different than 10.
I always try to solve problems like that just like you at first. Avoiding to use built in functions or methods. Kudos my friend.
The one problem in this case is that if you pass a really long string of numbers, the program could take a while to run trough every str(number).