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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.
Take a look at the comments in solution setup: you are not meant to allocate any memory, but you are expected to use the
doubled
buffer and write your answer into it, and then return thedoubled
.Your solution is almost correct, you just should write to
doubled
withoutmalloc
-ing it.This comment is hidden because it contains spoiler information about the solution