Goat Latin LeetCode solution in Java

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class Solution {
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  public String toGoatLatin(String sentence) {
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    StringBuffer sb = new StringBuffer();
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    StringBuffer temp = new StringBuffer("a"); // temporary stringbuffer
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    for (String str : sentence.split(" ")) {
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      if (beginsWithConsonant(str)) {
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        sb.append(str.substring(1)); // removing the first letter
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        sb.append(str.charAt(0)); // appending it to the end
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      } else {
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        sb.append(str);
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      }
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      sb.append("ma"); // appending "ma" to the end of the word (common operation)
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      sb.append(temp); // adding one letter 'a' to the end of each word
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      // the first word gets "a" added to the end,
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      // the second word gets "aa" added to the end,
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      // and so on.
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      temp.append("a"); // increasing the a's for every word
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      sb.append(" "); // to put space between words
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    }
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    return sb.toString()
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        .trim(); // using trim() to remove the one extra space from the end of string.
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  }
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  public boolean beginsWithConsonant(String str) {
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    return "aeiou".indexOf(str.toLowerCase().charAt(0)) == -1;
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  }
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}