Goal parser interpretation

#[test]
fn t1() {
    let start = std::time::Instant::now();
    let val = Solution::interpret("G()(al)".to_string());
    let expected = "Goal".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::interpret("G()()()()(al)".to_string());
    let expected = "Gooooal".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::interpret("(al)G(al)()()G".to_string());
    let expected = "alGalooG".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::interpret("G".to_string());
    let expected = "G".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::interpret("(al)(al)()".to_string());
    let expected = "alalo".to_string();
    log_result!(val == expected, "t5", start, &expected, &val);
    assert_eq!(val, expected);
}