Project 21 (CoreDataProject) seems not to have any code under GitHub and instructions seem wrong

[eswenson1]

The introduction to the CoreData project (21) in the SwiftUI section says to copy DataController.swift from the Bookworm project. There is no such file in the Bookworm project.

It doesn't appear possible to follow this project to completion because of the above.

[scrowder1172]

I found a historical copy and provided steps in a forum post. Let me know if this works. [https://www.hackingwithswift.com/forums/books/hws-ios-swiftui-edition-project-21-is-not-updated/28731]