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ParDo OneToMany
---------------

**Kata:** Please write a ParDo that maps each input sentence into words tokenized by whitespace 
(" ").

<div class="hint">
  You can call <a href="https://beam.apache.org/releases/javadoc/current/org/apache/beam/sdk/transforms/DoFn.OutputReceiver.html">
  OutputReceiver</a> multiple times in a
  <a href="https://beam.apache.org/releases/javadoc/current/org/apache/beam/sdk/transforms/ParDo.html">
  ParDo</a>.
</div>

<div class="hint">
  If you're using Beam version before v2.5.0, you can call
  <a href="https://beam.apache.org/releases/javadoc/current/org/apache/beam/sdk/transforms/DoFn.WindowedContext.html#output-OutputT-">
  DoFn.ProcessContext.output(..)</a> multiple times in a
  <a href="https://beam.apache.org/releases/javadoc/current/org/apache/beam/sdk/transforms/ParDo.html">ParDo</a>.
</div>
