Official docs:
https://book.cairo-lang.org/ch11-02-smart-pointers.html

The idea is to have a short and to-the-point article about the concept. Avoid copy/pasting everything from The Cairo Book; the Book should be used as a more in-depth learning resource for students after they finish the concept on Exercism (or they can use it in parallel).

Exercism Concepts docs:
https://exercism.org/docs/building/tracks/concepts

Use the following Rust's concept's about.md as inspiration for the format:
https://github.com/exercism/rust/blob/main/concepts/structs/about.md