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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.
It looks like it should be PadLeft... Lets say you have length 4 and your random returned 7, which is 111. Sure you can padresult. right and it will be 1110, which will be correct result. But this is 14, and ths means that 7(0111) will be never returned. Basiclly you need to pad most significant (left) bit, not last significant one...