 {
      String t = GetImage();
      return t.substring(t.length() - len, t.length()).toCharArray();
   }</div>
</li>
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<h4>Done</h4>
<pre>void&nbsp;Done()</pre>
<div class="block">The lexer calls this function to indicate that it is done with the stream
 and hence implementations can free any resources held by this class.
 Again, the body of this function can be just empty and it will not
 affect the lexer's operation.