same old fuzzy string algo, shiny to rust implementation

fuzzy.rs

use std::env;

//"./fuzzy andrew andy" should yield 0.91588783
fn main() {
    let args: Vec<String> = env::args().collect();
    let arg1 = &args[1];
    let arg2 = &args[2];
    println!("{}", fuzzy(arg1.to_string(), arg2.to_string()));
}


fn fuzzy(a: String, b: String) -> f32 {
    let mut reward = 0;
    let mut penalty = 0;

    for i in 0..a.len() {
        for j in i..a.len() {
            if b.contains(&a[i..j]) {
                reward += j * 2;
            } else {
                penalty += 1;
            }
        }
    }
    for i in 0..b.len() {
        for j in i..b.len() {
            if a.contains(&b[i..j]) {
                reward += j * 2;
            } else {
                penalty += 1;
            }
        }
    }

    let reward = reward as f32;
    let penalty = penalty as f32;

    return reward/(reward + penalty);
}