title: Convert from max heap to min heap
body: <p>Got this heap:</p>
  
  <pre><code>         10
          /  \
         9    8
        / \  / \
       7  6  5  4
      / \ /
     3  2 1
  </code></pre>
  
  <p>And i'm going to show each step when i convert it to a minimum heap from maximum. I'm not sure how i do it, any help please? 
  Thanks. </p>