sort-TXT-RUST

use std::fs::File;
use std::io::{Read, Write};
use std::cmp::Reverse;
use std::time::Instant;

fn sort_file(input_path: &str, output_path: &str) -> std::io::Result<()> {
    let mut input_file = File::open(input_path)?;
    let mut contents: Vec<u8> = Vec::new();
    input_file.read_to_end(&mut contents)?;

    let space = ' ' as u8;
    let space_count = contents.iter().filter(|&&c| c == space).count();
    contents.retain(|&c| c != space);
    contents.sort();
    contents.extend(vec![space; space_count]);

    let mut output_file = File::create(output_path)?;
    output_file.write_all(&contents)?;

    Ok(())
}

fn main() {
    let start = Instant::now();
    sort_file("input.txt", "output.txt").unwrap();
    let end = Instant::now();
    println!("Rust Time {:?}", end - start);
}