title: replace all characters in a string with asterisks
body: <p>I have a string</p>
  
  <pre><code>name = "Ben"
  </code></pre>
  
  <p>that I turn into a list</p>
  
  <pre><code>word = list(name)
  </code></pre>
  
  <p>I want to replace the characters of the list with asterisks. How can I do this?</p>
  
  <p>I tried using the <code>.replace</code> function, but that was too specific and didn't change all the characters at once.</p>
  
  <p>I need a general solution that will work for any string.</p>