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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.
Those two strings are not isomorphic, you cannot get from one to the other with a 1:1 substitution cipher.
The test is fine. Read the description again.
m = 1021 -> 102 - (2 x 1) -> 100 -> 10 - 0 = 10
You should return [10, 2]