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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.
This kata is bugged and it does not handle rounding properly. The fact that you have problems is not your fault. The kata is wrong.
If you really want to pass tests, you need to use formula
double celsius = (temperature - 32.0) * 5 / 9.0;. But it should not be necessary. It's kata error.