Function naming

Source Code/18-06.rs:9–13

(p: Person)

        family_names: String,
    }
    fn naming(p: Person) -> String {
        format!("{} {}",
            p.personal_names,
            p.family_names)
    }
    let person = Person {
        personal_names: "John".to_string(),
        family_names: "Doe".to_string(),