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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.
Thanks for the link!
The description says:
Storing a number d (0 <= d <= 9) in an i32 does not cause any problem. Moreover I will not change the signature of the function when 160 guys passed the Rust kata, I will be afraid that invalidates all solutions.
Is it that which prevented you to pass?