def process jobs
      if jobs.is_a? Array
        p_map(jobs) {|job| process_job job }
      else
        process_job jobs
      end
    end
def process jobs
      if jobs.is_a? Array
        p_map(jobs) {|job| process_job job }
      else
        process_job jobs
      end
    end
cleans provided jobs
 @overload process(jobs, classification)
   @param  jobs [Hash] single Job
   @option title
   @option description
   @option id
   @option label
   @param  classification [Symbol] in `:industry`, `:function`, `:career_level`
 @overload process(jobs, classification)
   @param  jobs [Array<Hash>] list of Jobs
   @param  classification [Symbol] in `:industry`, `:function`, `:career_level`

 @return [Array<PreprocessedData>] list of processed job data - or singe job data