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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.
Watch for any "use" keywords. Indeed, sorted() needs the Itertools crate.
by that time i didn't know about sprintf)
yeah,asprintf is not standard.should use malloc and so on.
IIUC if there are more arguments than required by format, the extraneous arguments are evaluated and ignored.
Ref: https://en.cppreference.com/w/c/io/fprintf
+1(pun inside... x) )