create a password with a custom length and lowercase letters in rust

To generate a password with a custom length and lowercase letters, you can use Rust's built-in rand crate to generate random letters and the rand::Rng trait to generate a random password of a specified length. Here is an example Rust code that demonstrates how to generate such a password:

main.rs
use rand::Rng;

fn generate_password(length: usize) -> String {
    const CHARSET: &[u8] = b"abcdefghijklmnopqrstuvwxyz";
    let mut rng = rand::thread_rng();

    (0..length)
        .map(|_| {
            let idx = rng.gen_range(0, CHARSET.len());
            char::from(CHARSET[idx])
        })
        .collect()
}

fn main() {
    let password = generate_password(10);
    println!("{}", password);
}
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In the code above, we define a function called generate_password that takes in a length parameter and returns a random string that contains only lowercase letters with the specified length. The const CHARSET: &[u8] defines the set of characters to choose from, which in this case is only the lowercase letters.

Inside the generate_password function, we create a random number generator using thread_rng and then generate a random string by selecting random characters from the character set CHARSET and converting them to characters using the char::from function. Finally, we collect the characters into a string using the collect method.

In the main function, we simply call the generate_password function with a length of 10 and print the generated password to the console.