Goal Parser Interpretation - LeetCode solutions

Problem

You own a Goal Parser that can interpret a string command. The command consists of an alphabet of "G", "()" and/or "(al)" in some order. The Goal Parser will interpret "G" as the string "G", "()" as the string "o", and "(al)" as the string "al". The interpreted strings are then concatenated in the original order.

Given the string command, return **the *Goal Parser*'s interpretation of **command.

Example 1:

Input: command = "G()(al)"
Output: "Goal"
Explanation:&nbsp;The Goal Parser interprets the command as follows:
G -> G
() -> o
(al) -> al
The final concatenated result is "Goal".

Example 2:

Input: command = "G()()()()(al)"
Output: "Gooooal"

Example 3:

Input: command = "(al)G(al)()()G"
Output: "alGalooG"

Constraints:

1 <= command.length <= 100
command consists of "G", "()", and/or "(al)" in some order.

Solution (Java)

class Solution {
    public String interpret(String command) {
        StringBuilder sb = new StringBuilder();
        int i = 0;
        while (i < command.length()) {
            if (command.charAt(i) == '(' && command.charAt(i + 1) == ')') {
                sb.append("o");
                i++;
            } else if ((command.charAt(i) != '(' || command.charAt(i + 1) == ')')
                    && command.charAt(i) != ')') {
                sb.append(command.charAt(i));
            }
            i++;
        }
        return sb.toString();
    }
}

Explain:

nope.

Complexity:

Time complexity : O(n).
Space complexity : O(n).