You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: _140_word_break_2.rs
    path of file: ./repos/rustgym/leetcode/src/d1
    
    the code of the file until where you have to start completion: struct Solution;

use std::collections::hash_map::DefaultHasher;
use std::collections::HashSet;
use std::hash::Hasher;

impl Solution {
    fn word_break(s: String, word_dict: Vec<String>) -> Vec<String> {
        let n = s.len();
        let mut dict: HashSet<u64> = HashSet::new();
        let mut alphabet: Vec<bool> = vec![false; 256];

    
fn test() {
    let s = "catsanddog".to_string();
    let word_dict = vec_string!["cat", "cats", "and", "sand", "dog"];
    let mut res = vec_string!["cats and dog", "cat sand dog"];
    let mut ans = Solution::word_break(s, word_dict);
    res.sort();
    ans.sort();
    assert_eq!(ans, res);
    let s = "pineapplepenapple".to_string();
    let word_dict = vec_string!["apple", "pen", "applepen", "pine", "pineapple"];
    let mut res = vec_string![
        "pine apple pen apple",
        "pineapple pen apple",
        "pine applepen apple"
    ];
    let mut ans = Solution::word_break(s, word_dict);
    res.sort();
    ans.sort();
    assert_eq!(ans, res);
    let s = "catsandog".to_string();
    let word_dict = vec_string!["cats", "dog", "sand", "and", "cat"];
    let mut res = vec_string![];
    let mut ans = Solution::word_break(s, word_dict);
    res.sort();
    ans.sort();
    assert_eq!(ans, res);
}