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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.
Am I missing something? The test case 10 == 0001 0000 doesn't make any sense. The Decimal number 10 == 0000 1010 (1(8) + 0(4) + 1(2) + (0)1).
The wording on this kata is horrific. It's supposed to be a programming exercise not a riddle disguised as a programming exercise. We are not psychic, so no obscure riddles please.