These exercises are adapted from [pnkfelix](https://github.com/rustlings/rustlings/blob/master)'s [Rust Tutorial](https://pnkfelix.github.io/rust-examples-icfp2014/) -- Thank you Felix!!!
For this exercise check out the chapters:
- [Ownership](https://doc.rust-lang.org/book/2018-edition/ch04-01-what-is-ownership.html)
- [Reference and borrowing](https://doc.rust-lang.org/book/2018-edition/ch04-02-references-and-borrowing.html)
of the Rust Book.
