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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 final result is checked for 140 characters, not the input string.
Fixed
This one is confusing. n is only supposed to be an odd number, but in the test cases, I am given even numbers. I have code that works only for odd numbers, and not for even ones. If n is supposed to be even, then how are the expansions supposed to be worked out?