Goal Parser Interpretation LeetCode solution in Java

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class Solution {
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  public String interpret(String c) {
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    StringBuilder st = new StringBuilder();
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    for (int i = 0; i < c.length(); i++) {
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      if (c.charAt(i) == 'G') st.append("G");
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      else {
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        if (c.charAt(i + 1) == ')') {
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          st.append("o");
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          i++;
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        } else {
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          st.append("al");
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          i = i + 3;
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        }
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      }
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    }
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    return st.toString();
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  }
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}