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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.
Such a ______. I have no words, you better read the problem before solving it. :(
Well done buddy!
At line 4: output[string[char]] = string[char]
It can be done in this way: output[char] = char; while in for loop use "of" keyword instead of "in"