title: Searching for duplicates and remove them
body: <p>sometimes I have a string like this</p>
  
  <pre class="lang-py prettyprint-override"><code>string = "Hett, Agva,"
  </code></pre>
  
  <p>and sometimes I will have duplicates in it.
  </p>
  
  <pre><code>string = "Hett, Agva, Delf, Agva, Hett,"
  </code></pre>
  
  <p>how can I check if my string has duplicates and then if it does remove them?</p>
  
  <p>UPDATE.</p>
  
  <p>So in the second string i need to remove Agva, and Hett, because there is 2x of them in the string</p>