Words counter

words_counter.rs

extern crate unicase;

use std::{
  collections::HashMap,
  iter::FromIterator,
  fs
};

use unicase::Ascii;

pub fn main() {
  let big_string = fs::read_to_string("file.txt").unwrap();
  let mut words_counter: HashMap<Ascii<&str>, u32> = HashMap::new();
  for word in big_string.split(&[' ',',','.',';',':','\n','\r'][..]) {
    if word.is_empty() { continue; }
    let strx = Ascii::new(word);
    match words_counter.get_mut(&strx) {
      Some(cx) => *cx += 1,
      None => { words_counter.insert(strx, 1); }
    };
  }
  let mut vec_from_iter = Vec::from_iter(words_counter);
  vec_from_iter.sort_by(|&(_, a), &(_, b)| b.cmp(&a));
  let top_x : Vec<String> =
    vec_from_iter.into_iter().take(5)
                 .map(|(k, v)| format!("{} : {}", k, v))
                 .collect();
  print!("{}", top_x.join("\n").as_str());
}