ascii_art.rs

fn art_slice(ln: &str, step: usize, idx: usize) -> &str {
    let ofs = step * idx;
    &ln[ofs..(ofs + step)]
}

fn ch_index(ch: char) -> usize {
    let lookup_ch = if 'A' <= ch && ch <= 'Z' { ch } else { '?' };
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ?".chars().position(|x| x == lookup_ch).unwrap()
}

fn main() {
    let rows = vec![
        " #  ##   ## ##  ###  ##  ## # # ###  ## # # #   # # ###  #  ##   #  ##   ## ### # # # # # # # # # # ### ###",
        "# # # # #   # # #   #   #   # #  #    # # # #   ### # # # # # # # # # # #    #  # # # # # # # # # #   #   #",
        "### ##  #   # # ##  ##  # # ###  #    # ##  #   ### # # # # ##  # # ##   #   #  # # # # ###  #   #   #   #",
        "# # # # #   # # #   #   # # # #  #  # # # # #   # # # # # # #    ## # #   #  #  # # # # ### # #  #  #    #",
        "# # ##   # ##  ### #    ## # # ###  #  # # ### # # # #  #  #     # # # ##   #  ###  #  # # # #  #  ###  ."
    ];
    let t = "PIZZAPIZZA\n";
    let l = 4;
    let h = 5;    
    
    // -------------------------------
    for ln in rows {
        for c in t.to_uppercase().chars() {
            print!("{}", art_slice(&ln.to_string(), l, ch_index(c)));
        }
        println!()
    }
}

ascii_art_from_site.rs

use std::io;

macro_rules! parse_input {
    ($x:expr, $t:ident) => ($x.trim().parse::<$t>().unwrap())
}

/**
 * Auto-generated code below aims at helping you parse
 * the standard input according to the problem statement.
 **/
fn main() {
    let mut input_line = String::new();
    io::stdin().read_line(&mut input_line).unwrap();
    let l = parse_input!(input_line, usize);
    let mut input_line = String::new();
    io::stdin().read_line(&mut input_line).unwrap();
    let h = parse_input!(input_line, i32);
    let mut input_line = String::new();
    io::stdin().read_line(&mut input_line).unwrap();
    let t = input_line.trim_right().to_string();
    let t_upper = t.to_uppercase();
    for i in 0..h as usize {
        let mut input_line = String::new();
        io::stdin().read_line(&mut input_line).unwrap();
        let row = input_line.trim_right().to_string();
        
        eprintln!("row={:?}", row);
        for c in t_upper.chars() {
            print!("{:<l$}", art_slice(&row, l, ch_index(c)), l=l);
        }
        println!();
    }

    // Write an action using println!("message...");
    eprintln!("t={:?}", t);
    eprintln!("l={:?} h={:?}", l, h);
}

fn art_slice(ln: &str, step: usize, idx: usize) -> String {
     ln.chars().skip(step * idx).take(step).collect()
}


fn ch_index(ch: char) -> usize {
    let lookup_ch = if 'A' <= ch && ch <= 'Z' { ch } else { '?' };
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ?".chars().position(|x| x == lookup_ch).unwrap()
}