title: Remove plural words from a text file
body: <p>I have a huge text file which contains categories Like this:</p>
  
  <pre><code>mango    
  mangoes   
  orange   
  oranges   
  cat   
  cats   
  </code></pre>
  
  <p>I want to remove those plural words from the line. So that it remains:</p>
  
  <pre><code>mango   
  orange   
  cat   
  </code></pre>