#[derive(Debug)]
struct test<'a> {
    part1: &'a str,
    part2: &'a str,
}

impl<'a> test<'a> {
    pub fn new() -> test<'a> {
        test {
            part1: "PART1",
            part2: "PART2",
        }
    }

    pub fn from_char(data: &[char]) -> test<'a> {
        let mut def = test::new();
        let my_str = data[0..3].iter().collect::<String>();
        def.part1 = &my_str[..];
        def
    }
}

fn main() {
    let a = vec!['a', 'b', 'c', 'd', 'e', 'f'];
    println!("{:?}", &a[0..3].iter().collect::<String>());
    println!("{:?}", test::new());
    println!("{:?}",test::from_char(&a));
}