title: nth word in a text
body: <p>how can I find the nth word in a text.</p>
  
  <p>example:</p>
  
  <pre><code>my_txt("hello to you all" , 3)
  
  all
  </code></pre>
  
  <p>I don't wanna use any built in function ...and this is not a homework :D</p>