Code shared from the Rust Playground

playground.rs

fn main(){
    let spots = make_board();
    render(&spots)
}

fn make_board() -> Vec<Tokens> {
    let mut count = 0;
    let mut spots:Vec<Tokens> = Vec::new();
    let values = [4,9,2,3,5,7,8,1,6];
    for val in &values {
        let tok = Tokens::new(count, *val, ' ');
        spots.push(tok);
    }
    spots
}

fn render(spots: &Vec<Tokens>) {
    println!("   |   |   ");
    println!(" {} | {} | {} ", spots[0].chr, spots[1].chr, spots[2].chr);
    println!("   |   |   ");
    println!("   |   |   ");
    println!(" {} | {} | {} ", spots[3].chr, spots[4].chr, spots[5].chr);
    println!("   |   |   ");
    println!("   |   |   ");
    println!(" {} | {} | {} ", spots[6].chr, spots[7].chr, spots[8].chr);
    println!("   |   |   ");
}

struct Tokens{
    idx:i8,
    val:i8,
    chr:char,
}

impl Tokens{
    fn new(idx: i8, val: i8, chr: char) -> Tokens {
        Tokens { idx: idx, val: val, chr: chr}
    }

    fn update(&mut self, chr: &char) {
        self.chr = chr;
    }
}