code: def _element_to_string(el):
      string = ""
  
      for x in el.iterchildren():
          string += "\n" + _element_to_string(x)
  
      text = el.text.strip() if el.text else ""
      tail = el.tail.strip() if el.tail else ""
  
      return text + string + "\n" + tail
  
imports: from openpyxl.cell import cell
  from openpyxl.styles import Font, Alignment, PatternFill, NamedStyle, Border, Side, Color
  from openpyxl.styles.fills import FILL_SOLID
  from openpyxl.styles.numbers import FORMAT_CURRENCY_USD_SIMPLE, FORMAT_PERCENTAGE
  from openpyxl.styles.colors import BLACK
label_desc: Use image node_id 6 for calling a global function with example usage: _element_to_string(el) and returns: unknown