Loading collection data...
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.
function isprime is a "left over" and forgotten to delete...see second solution...
Tried to work with Dates function, but didn't work. Forgot to delete the "using Dates".