Defanging an ip address

#[test]
fn t1() {
    let start = std::time::Instant::now();
    let val = Solution::defang_i_paddr("1.1.1.1".to_string());
    let expected = "1[.]1[.]1[.]1".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::defang_i_paddr("255.100.50.0".to_string());
    let expected = "255[.]100[.]50[.]0".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::defang_i_paddr("0.0.0.0".to_string());
    let expected = "0[.]0[.]0[.]0".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::defang_i_paddr("192.168.1.1".to_string());
    let expected = "192[.]168[.]1[.]1".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::defang_i_paddr("10.0.0.1".to_string());
    let expected = "10[.]0[.]0[.]1".to_string();
    log_result!(val == expected, "t5", start, &expected, &val);
    assert_eq!(val, expected);
}