title: Clean3.0 get directory contents
body: <p>I am using Cleanide for <code>Clean3.0</code> programming language.
  What I am trying to do is to implement a function that receive name of a directory in my system, and return a list of all the files in that directory.</p>
  
  <p>I don't know if the defintion of such function needs to be like <code>File -&gt; [string]</code> or maybe something else, even that directory is a file maybe this is not the developers of <code>Clean</code> meant...</p>
  
  <p>Thank a lot!</p>