rustgym 0.2.0

rustgym solutions
Documentation 
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struct Solution;

impl Solution {
    fn largest_number(nums: Vec<i32>) -> String {
        let mut v: Vec<String> = nums.iter().map(|x| x.to_string()).collect();
        v.sort_unstable_by(|a, b| format!("{}{}", b, a).cmp(&format!("{}{}", a, b)));
        let mut res: String = "".to_string();
        if v[0] == "0" {
            return "0".to_string();
        }
        for s in v {
            res += &s;
        }
        res
    }
}

#[test]
fn test() {
    let nums = vec![10, 2];
    let res = "210".to_string();
    assert_eq!(Solution::largest_number(nums), res);
    let nums = vec![3, 30, 34, 5, 9];
    let res = "9534330".to_string();
    assert_eq!(Solution::largest_number(nums), res);
    let nums = vec![0, 0];
    let res = "0".to_string();
    assert_eq!(Solution::largest_number(nums), res);
    let nums = vec![0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
    let res = "9876543210".to_string();
    assert_eq!(Solution::largest_number(nums), res);
}