// Define a struct named `Person`
// with three fields: `first_name`,
// `last_name`, and `age`.
struct Person {
    first_name: String,
    last_name: String,
    age: u32,
}

// Implement a method for the `Person` struct.
impl Person {
    fn full_name(&self) -> String {
        format!("{} {}", self.first_name, self.last_name)
    }
}

fn main() {
    // Create a new instance of the `Person` struct.
    let person = Person {
        first_name: String::from("John"),
        last_name: String::from("Doe"),
        age: 30,
    };

    // Access the fields of the `Person` struct.
    println!("First Name: {}", person.first_name);
    println!("Last Name: {}", person.last_name);
    println!("Age: {}", person.age);

    // Call the method on the `Person` instance.
    let full_name = person.full_name();
    println!("Full Name: {}", full_name);
}