Multiple files / folders feature added #6
Merged
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Added functionality for passing multiple files at once.
Now files and folders can be passed as arguments, PDF files will be cleaned if they exist, otherwise a message error will be printed and the program execution will continue. If a folder is passed as an argument, the program will look for PDF files and folders, it will clean the files and repeat this process for the folders, thus, searching for PDF files recursively.
For the sake of avoiding unnecessarily long print messages when cleaning multiple files at once, the "short" option (-s) has been added not to show metadata about cleaned files.