Update values in vector of structs using map

---

examples/vectors/update-vector-of-structs/src/main.rs

struct Course {
    name: String,
}

fn main() {
    let courses: Vec<Course> = vec![
        Course {
            name: String::from("Programming Rust"),
        },
        Course {
            name: String::from("Git"),
        },
    ];
    for course in &courses {
        println!("{}", course.name);
    }

    let courses: Vec<Course> = courses
        .into_iter()
        .map(|mut course| {
            course.name.push_str(" and more");
            course
        })
        .collect();

    for course in &courses {
        println!("{}", course.name);
    }
}

Programming Rust
Git
Programming Rust and more
Git and more