code: def serialize_text(out, text):
      
      padding = len(out)
      # we need to add padding to all lines
      # except the first one
      add_padding = padding_adder(padding)
      text = add_padding(text, ignore_first_line=True)
  
      return out + text
docs: This method is used to append content of the `text`
      argument to the `out` argument.
  
      Depending on how many lines in the text, a
      padding can be added to all lines except the first
      one.
  
      Concatenation result is appended to the `out` argument.