Challenge 1: A First Cargo Project — Possible Solution
====================================================================

Terminal:
  cargo new greeting
  cd greeting

src/main.rs:
fn main() {
    println!("Dana");
    println!("Welcome to Rust!");
}

Terminal:
  cargo run

Output:
Dana
Welcome to Rust!

WHY THIS WORKS AS AN ANSWER
------------------------------
cargo new greeting creates the standard project structure (Cargo.toml
+ src/main.rs) in one command — no manual file/folder setup needed,
exactly the "batteries included" build tool this chapter described.

Editing src/main.rs replaces the default "Hello, world!" body with two
separate println! calls — one printing a name, one printing a short
greeting — each producing its own line of output, matching the two-
line requirement exactly.

cargo run compiles and immediately runs the program in one step, the
same convenience go run provides for Go, just invoked through cargo
instead of a language-specific run command.