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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.
I haven't checked whether your code fails or passes, but you are definitely getting a bunch of warnings (which are not errors, though they appear in stderr in the output). Write your code in a proper IDE with linting support (e.g. VS Code + RustAnalyzer) to see all the slightly silly thing's your code is doing.
I just solved this and there are not errors in sample or submission tests.
It's normal to see such a big result because you need to find the least common multiple of several elements. For example, the least common multiple of 11, 13, 15 and 17 is
11 * 13 * 15 * 17 = 36465. Maybe it could help to (re-)read about what a least common multiple is. :)