def parse_shared_strings
      shared_strings_target = relationships.target_by_type('sharedString')
      return if shared_strings_target.empty?

      shared_string_file = "#{OOXMLDocumentObject.path_to_folder}/xl/#{shared_strings_target.first}"
      @shared_strings_table = SharedStringTable.new(parent: self).parse(shared_string_file)
    end
def parse_shared_strings
      shared_strings_target = relationships.target_by_type('sharedString')
      return if shared_strings_target.empty?

      shared_string_file = "#{OOXMLDocumentObject.path_to_folder}/xl/#{shared_strings_target.first}"
      @shared_strings_table = SharedStringTable.new(parent: self).parse(shared_string_file)
    end
Do work for parsing shared strings file