Goal Parser Interpretation LeetCode solution in C++

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class Solution {
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 public:
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  string interpret(string command) {
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    string s = "", str;
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    for (char ch : command) {
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      s += ch;
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      if (s == "G") {
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        str += "G";
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        s = "";
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      } else if (s == "()") {
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        str += "o";
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        s = "";
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      } else if (s == "(al)") {
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        str += "al";
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        s = "";
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      }
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    }
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    return str;
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  }
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};