Rust application to translate into morse code

morse.rs

use std::fmt::Formatter;

trait MorseCode {
    fn to_morse_code(&self) -> Message;
}

impl MorseCode for String {
    fn to_morse_code(&self) -> Message {
        self.chars()
            .flat_map(|c| c.to_ascii_lowercase().to_morse_code())
            .collect()
    }
}

impl MorseCode for char {
    // Yes. I know I could use a HashMap
    fn to_morse_code(&self) -> Message {
        let pulses = match self {
            'a' => vec![Pulse::Short, Pulse::Long],
            'b' => vec![Pulse::Long, Pulse::Short, Pulse::Short, Pulse::Short],
            'c' => vec![Pulse::Long, Pulse::Short, Pulse::Long, Pulse::Short],
            'd' => vec![Pulse::Long, Pulse::Short, Pulse::Short],
            'e' => vec![Pulse::Short],
            'f' => vec![Pulse::Short, Pulse::Short, Pulse::Long, Pulse::Short],
            'g' => vec![Pulse::Long, Pulse::Long, Pulse::Short],
            'h' => vec![Pulse::Short, Pulse::Short, Pulse::Short, Pulse::Short],
            'i' => vec![Pulse::Short, Pulse::Short],
            'j' => vec![Pulse::Short, Pulse::Long, Pulse::Long, Pulse::Long],
            'k' => vec![Pulse::Long, Pulse::Short, Pulse::Long],
            'l' => vec![Pulse::Short, Pulse::Long, Pulse::Short, Pulse::Short],
            'm' => vec![Pulse::Long, Pulse::Long],
            'n' => vec![Pulse::Long, Pulse::Short],
            'o' => vec![Pulse::Long, Pulse::Long, Pulse::Long],
            'p' => vec![Pulse::Short, Pulse::Long, Pulse::Long, Pulse::Short],
            'q' => vec![Pulse::Long, Pulse::Long, Pulse::Short, Pulse::Long],
            'r' => vec![Pulse::Short, Pulse::Long, Pulse::Short],
            's' => vec![Pulse::Short, Pulse::Short, Pulse::Short],
            't' => vec![Pulse::Long],
            'u' => vec![Pulse::Short, Pulse::Short, Pulse::Long],
            'v' => vec![Pulse::Short, Pulse::Short, Pulse::Short, Pulse::Long],
            'w' => vec![Pulse::Short, Pulse::Long, Pulse::Long],
            'x' => vec![Pulse::Long, Pulse::Short, Pulse::Short, Pulse::Long],
            'y' => vec![Pulse::Long, Pulse::Short, Pulse::Long, Pulse::Long],
            'z' => vec![Pulse::Long, Pulse::Long, Pulse::Short, Pulse::Short],
            '0' => vec![
                Pulse::Long,
                Pulse::Long,
                Pulse::Long,
                Pulse::Long,
                Pulse::Long,
            ],
            '1' => vec![
                Pulse::Short,
                Pulse::Long,
                Pulse::Long,
                Pulse::Long,
                Pulse::Long,
            ],
            '2' => vec![
                Pulse::Short,
                Pulse::Short,
                Pulse::Long,
                Pulse::Long,
                Pulse::Long,
            ],
            '3' => vec![
                Pulse::Short,
                Pulse::Short,
                Pulse::Short,
                Pulse::Long,
                Pulse::Long,
            ],
            '4' => vec![
                Pulse::Short,
                Pulse::Short,
                Pulse::Short,
                Pulse::Short,
                Pulse::Long,
            ],
            '5' => vec![
                Pulse::Short,
                Pulse::Short,
                Pulse::Short,
                Pulse::Short,
                Pulse::Short,
            ],
            '6' => vec![
                Pulse::Long,
                Pulse::Short,
                Pulse::Short,
                Pulse::Short,
                Pulse::Short,
            ],
            '7' => vec![
                Pulse::Long,
                Pulse::Long,
                Pulse::Short,
                Pulse::Short,
                Pulse::Short,
            ],
            '8' => vec![
                Pulse::Long,
                Pulse::Long,
                Pulse::Long,
                Pulse::Short,
                Pulse::Short,
            ],
            '9' => vec![
                Pulse::Long,
                Pulse::Long,
                Pulse::Long,
                Pulse::Long,
                Pulse::Short,
            ],
            _ => vec![],
        };
        vec![pulses]
    }
}

type Message = Vec<Letter>;

type Letter = Vec<Pulse>;

#[derive(Debug, PartialEq)]
enum Pulse {
    Short,
    Long,
}

impl std::fmt::Display for Pulse {
    fn fmt(&self, f: &mut Formatter) -> std::fmt::Result {
        match self {
            Pulse::Short => write!(f, "."),
            Pulse::Long => write!(f, "-"),
        }
    }
}

fn print_morse_code(message: Message) {
    for letter in message {
        for pulse in letter {
            print!("{}", pulse);
        }
        print!(" ");
    }
    println!();
}

fn main() {
    let message = String::from("Hello, World 0123456789").to_morse_code();
    print_morse_code(message);
}

output.txt

.... . .-.. .-.. ---   .-- --- .-. .-.. -..  ----- .---- ..--- ...-- ....- ..... -.... --... ---.. ----. 

You can decode here https://morsedecoder.com/