title: vim: how to replace "empty_space\n" into "\n"
body: <p>I have a text file ending with "empty_space\n"</p>
  
  <pre><code>...{empty_space}
  ...{empty_space}
  </code></pre>
  
  <p>I want to remove the empty spaces at the end so to say.</p>
  
  <pre><code>...
  ...
  </code></pre>
  
  <p>How can I do that?</p>