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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.
The output should have been an optional tuple of an int and a char, not a nullable, necessarily heterogeneous, array. This is overly monolinguistic.
I'm not sure what can be done now. Python ( and, proposed, Haskell ) correctly use a tuple, but the description suffers.
Haskell translation
this translation modifies the description
intersting , thanks anthor
Nice kata to warm up