Find first palindromic string in the array

#[test]
fn t1() {
    let start = std::time::Instant::now();
    let val = Solution::first_palindrome(vec!["abc".to_string(), "car".to_string(), "ada".to_string(), "racecar".to_string(), "cool".to_string()]);
    let expected = "ada".to_string();
    log_result!(val == expected, "t1", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t2() {
    let start = std::time::Instant::now();
    let val = Solution::first_palindrome(vec!["notapalindrome".to_string(), "racecar".to_string()]);
    let expected = "racecar".to_string();
    log_result!(val == expected, "t2", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t3() {
    let start = std::time::Instant::now();
    let val = Solution::first_palindrome(vec!["def".to_string(), "ghi".to_string()]);
    let expected = "".to_string();
    log_result!(val == expected, "t3", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t4() {
    let start = std::time::Instant::now();
    let val = Solution::first_palindrome(vec!["a".to_string()]);
    let expected = "a".to_string();
    log_result!(val == expected, "t4", start, &expected, &val);
    assert_eq!(val, expected);
}

#[test]
fn t5() {
    let start = std::time::Instant::now();
    let val = Solution::first_palindrome(vec!["abba".to_string(), "noon".to_string()]);
    let expected = "abba".to_string();
    log_result!(val == expected, "t5", start, &expected, &val);
    assert_eq!(val, expected);
}