Q1. Identify files of a given extension (or the inverse of a given list)
Q2. Create directories named from the extensions. Suppress errors attempting to create directories that already exist (this allows you to run cleansort multiple times without seeing unnecessary messages)
Q3. Move the files from the given directory into extension-named directories that will be created in the same directory from which cleansort is run
Q4. Display a message if no files are found or available to be cleansorted