rustlings/exercises/06_move_semantics/move_semantics5.rs

// TODO: Fix the compiler errors without changing anything except adding or
// removing references (the character `&`).

fn main() {
    let data = "Rust is great!".to_string();

    get_char(data);

    string_uppercase(&data);
}

// Shouldn't take ownership
fn get_char(data: String) -> char {
    data.chars().last().unwrap()
}

// Should take ownership
fn string_uppercase(mut data: &String) {
    data = &data.to_uppercase();

    println!("{data}");
}