Struct Guy

use std::io;

struct Guy {
    name: String,
    family: String,
    group: String,
    age: u8,
}

impl Guy {
    fn change(&mut self) {
        let mut _new_name: String = String::new();
        io::stdin().read_line(&mut _new_name).expect("read_line _new_name");
        self.name = _new_name;
        let mut _new_family: String = String::new();
        io::stdin().read_line(&mut _new_family).expect("read_line _new_family");
        self.family = _new_family;
        let mut _new_group: String = String::new();
        io::stdin().read_line(&mut _new_group).expect("read_line _new_group");
        self.group = _new_group;
        let mut _new_age: u8 = input_u8();
        self.age =_new_age;
    }
}

fn input_u8() -> u8 {
    let mut _s: String = String::new();
    io::stdin().read_line(&mut _s).expect("read_line input_u8");
    return _s.trim().parse().expect("convert") // return не обязателен, просто удобно
}

fn main() {
    let mut _pal = Guy {
        name: String::from(""),
        family: String::from(""),
        group: String::from(""),
        age: 0,
    };
    let mut _name: String = String::new();
    io::stdin().read_line(&mut _name).expect("33");
    _pal.name =_name;
    let mut _family: String = String::new();
    io::stdin().read_line(&mut _family).expect("36");
    _pal.family =_family;
    let mut _group: String = String::new();
    io::stdin().read_line(&mut _group).expect("38");
    _pal.group = _group;
    let _age: u8 = input_i32();
    _pal.age = _age;
    _pal.change();
    println!("{} {} {} {}",_pal.name, _pal.family, _pal.group, _pal.age);
}