def get_shared_string(value)
      return '' if value == ''

      string = root_object.shared_strings_table.string_indexes[value.to_i]
      @character = string.run
      @raw_text = string.text
    end
def get_shared_string(value)
      return '' if value == ''

      string = root_object.shared_strings_table.string_indexes[value.to_i]
      @character = string.run
      @raw_text = string.text
    end
Get shared string by it's number
 @return [Nothing]