title: Joining a series of paths components in common lisp
body: <p>How do I join a series of path components in common lisp?</p>
  
  <p>In python, I can do, </p>
  
  <pre><code>`os.path.join("/home/", username, "dira", "dirb", "dirc");`
  </code></pre>
  
  <p>What would be the equivalent in common lisp?</p>
  
  <p>Of course I can write my own function, but I suspect I should be able to use something built-in.</p>