Yell at this please

hangman.rs

use std::io;
use std::iter;

use std::collections::BTreeSet;

use rand::seq::SliceRandom;
use rand::thread_rng;

static WORDS: &'static str = include_str!("wordlist.txt");

fn format_display_string(secret: &str, guess_chars: &BTreeSet<char>) -> String {
    let mut display_string: String = String::new();
    for letter in secret.chars() {
        let c: char = if guess_chars.contains(&letter) {
            letter
        } else {
            '_'
        };
        display_string.push(c);
    }
    display_string.extend(iter::repeat('_').take(secret.len() - display_string.len()));
    display_string
}

fn get_char() -> char {
    let mut input: String = String::new();
    let guess: char;
    loop {
        println!("Enter a single character:");
        io::stdin()
            .read_line(&mut input)
            .expect("Failed to get input");
        if input.trim().chars().count() != 1 {
            input.clear();
            continue;
        };
        guess = input.chars().next().unwrap();
        break;
    }
    guess
}

fn main() {
    let mut lives: i32 = 10;
    let mut win: bool = false;

    let words = WORDS.split_whitespace().collect::<Vec<&str>>();

    let secret: &str = words.choose(&mut thread_rng()).unwrap();
    let secret_chars: BTreeSet<char> = secret.chars().collect();
    let mut guess: char;
    let mut guess_chars: BTreeSet<char> = BTreeSet::new();

    println!("Welcome to Hangman!");

    while lives > 0 {
        let display_string: String = format_display_string(&secret, &guess_chars);
        if display_string == secret {
            win = true;
            break;
        };

        println!("\nYou have {} lives left.", lives);
        println!("Word: {}", display_string);
        println!(
            "Guessed characters: {}",
            guess_chars.iter().collect::<String>()
        );

        guess = get_char();

        if guess_chars.contains(&guess) {
            continue;
        } else {
            guess_chars.insert(guess);
        };

        if !secret_chars.contains(&guess) {
            lives -= 1;
        };
    }

    if win {
        println!(
            "\nYou win! The word was {}. You had {} lives remaining.",
            secret, lives
        );
    } else {
        println!("You lose! The word was {}", secret)
    }
}