title: Interleaving "^" character in a string
body: <p>I'm currently tasked with replacing <code>"SUPER MAN"</code> with <code>"S^U^P^E^R M^A^N"</code>.</p>
  
  <p>I've tried <code>print("SUPER MAN".replace("" "", "^"))</code> but end up with <code>^S^U^P^E^R^ ^M^A^N^</code>.</p>
  
  <p>How can I fix this?</p>