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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.
My solution is the same. But I use static result slice size. It gives me almost 2 times better performance. Example benchmarking for my and your code:
BenchmarkJosephusDmitryermichev-4 5081414 207 ns/op
BenchmarkJosephusRobinDeNeef-4 3175298 376 ns/op