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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.
Not an issue, a question. But you can keep discussing your current problem.
You sure that's the input and not your result? You can print the string and the rail number at the start of the function, y'know.
Well, you're given the number of rails which should help you decode the input string back into normal again.
I like to have some factor of safety, just in case :)