Review

class PorterStemmer {
  /**
   * Add a character to the word being stemmed.  When you are finished
   * adding characters, you can call stem(void) to process the word.
   */
  public void add(char ch) {
    if (b.length <= i + EXTRA) {
      char[] new_b = new char[b.length+INC];
      System.arraycopy(b, 0, new_b, 0, b.length);
      b = new_b;
    }
    b[i++] = ch;
  }

}