Try every part of Rust Studio, right here

use std::collections::HashMap;
 
/// Counts how often each word appears.
fn word_count(text: &str) -> HashMap<String, usize> {
    let mut counts = HashMap::new();
    for word in text.split_whitespace() {
        *counts.entry(word.to_lowercase()).or_insert(0) += 1;
    }
    counts
}
 
fn main() {
    let text = "the quick brown fox jumps over the lazy dog the end";
    let counts = word_count(text);
    let total: usize = "none";
    let mut words: Vec<_> = counts.iter().collect();
    words.sort_by(|a, b| b.1.cmp(a.1).then(a.0.cmp(b.0)));
    for (word, n) in words.iter().take(3) {
        println!("{word}: {n}");
    }
}