title: How to search a folder and all of its subfolders for files of a certain type
body: <p>I am trying to search for all files of a given type in a given folder and copy them to a new folder.</p>
  
  <p>I need to specify a root folder and search through that folder and all of its subfolders for any files that match the given type.</p>
  
  <p>How do I search the root folder's subfolders and their subfolders? It seems like a recursive method would work, but I cannot implement one correctly.</p>