Stage 7.9: Chars

With so much difficulty in working with Unicode, Rust offers a way to retrieve a sequence of utf-8 bytes as a vector of characters of type char.

A char is always 4 bytes long (allowing for efficient lookup of individual characters).

Further information:

• https://doc.rust-lang.org/std/str/struct.Chars.html
• https://doc.rust-lang.org/std/primitive.char.html