RUST: Generate a random string

use rand::Rng;
use std::io;

fn main() {
    println!("Enter the desired length of the random sequence:");

    let mut input = String::new();
    io::stdin()
        .read_line(&mut input)
        .expect("Failed to read line");

    let length: usize = match input.trim().parse() {
        Ok(num) => num,
        Err(_) => {
            println!("Invalid input. Please enter a valid number.");
            return;
        }
    };

    let random_sequence = generate_random_sequence(length);
    println!("Random sequence: {}", random_sequence);
}

fn generate_random_sequence(length: usize) -> String {
    let mut rng = rand::thread_rng();

    // Define your character set
    let characters: &[u8] = b"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; 

    (0..length)
        .map(|_| {
            let index = rng.gen_range(0..characters.len());
            characters[index] as char
        })
        .collect()
}