#[derive(Debug)]
enum Relationship {
    PARENT,
    CHILD,
}

#[derive(Debug)]
struct Person {
    relationship: Relationship,
    name: String,
    age: u8,
}

impl Person {
    fn new(relationship: Relationship, name: &str, age: u8) -> Person {
        Person {
            relationship,
            name: name.to_string(),
            age,
        }
    }
}

fn main() {
    let mut persons = vec![
        Person::new(Relationship::PARENT, "foo", 65),
        Person::new(Relationship::CHILD, "foo jr", 25),
        Person::new(Relationship::PARENT, "bar", 50),
        Person::new(Relationship::CHILD, "bar jr", 20),
    ];
    for i in 0..(persons.len() - 1) {
        let mut first = persons.get_mut(i).unwrap();
        let mut second = persons.get_mut(i+1).unwrap();
        first.age /= 5;
        second.age += 1;
    }
    println!("{:?}", persons);
}