The app provide to create a random combination of files (every extension) for optimize a given space selected. The combination is the files with bold font. If you search a file in the program the results change text color in blue. Files with red text color are files that rename, move or delete to disk.
Now in a second window (aviable with CMD + R) is possible to use a tool for rename the files in automatic mode with particular dictionary and selection options after a preview of rename results.