def partialized(file)
        partial_file = file.split(File::SEPARATOR)
        partial_file[-1] = "_#{partial_file[-1]}" unless partial_file[-1].start_with?("_")
        partial_file.join(File::SEPARATOR)
      end
def partialized(file)
        partial_file = file.split(File::SEPARATOR)
        partial_file[-1] = "_#{partial_file[-1]}" unless partial_file[-1].start_with?("_")
        partial_file.join(File::SEPARATOR)
      end
Returns a partialized version of a file path
 partialized("v1/variants/variant") => "v1/variants/_variant"