Build a simple template engine in <100 lines of Rust code

This tutorial is aimed at beginner Rustaceans but you should be familiar with programming and working on the terminal. Rust is the modern, memory-safe programming language (with a fantastic web ecosystem!) that I'll be using in this tutorial. Packages in Rust are called "crates" and are typically published to crates.io. The primary code file for Rust libraries is src/lib.rs.