ar character in a string.
        </li>
        <li>
          <b>S_CH_DELETE</b> removes all occurrences of a character from a string.
        </li>
        <li>
          <b>S_CHOP</b> "chops out" a portion of a string, and closes up the hole.
        </li>
        <li>
          <b>S_CONTROL_BLANK</b> replaces control characters with blanks.
        </li>
        <li>
          <b>S_EQI</b> is a case insensitive comparison of two strings for equality.
        </li>
        <li>
          <b>S_FIRST_NONBL