The dir structure on those subdirectories will return only the two directories entries '.' and '..'. So, check length(d)==2 and the two d.name match the above is certain; I don't think there's a way two get two entries only and they not be anything but the above so just the length check would be all needed.
Of course, if there's anything otherwise left then the rmdir command will fail so the even simpler way is to just issue it in a try...catch block and those that are empty will disappear almost automagically! :)
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