title: Substring a string from the end of the string
body: <p>I need to remove two characters from the end of the string.</p>
  
  <p>So:</p>
  
  <pre><code>string = "Hello Marco !"
  </code></pre>
  
  <p>must be</p>
  
  <pre><code>Hello Marco
  </code></pre>
  
  <p>How can I do it?</p>