def find_max_occurence
      selected = @candidates.select{|k,v| v == @candidates.sort_by(&:last).last }.keys

      return selected.first if selected.count == 1
      return DEFAULT_DELIMITER if selected.include?(DEFAULT_DELIMITER)
    end
def find_max_occurence
      selected = @candidates.select{|k,v| v == @candidates.sort_by(&:last).last }.keys

      return selected.first if selected.count == 1
      return DEFAULT_DELIMITER if selected.include?(DEFAULT_DELIMITER)
    end
most occurence