code: def normalize(string: str) -> str:
      
      string = string.replace("\t", "    ")
      lines = string.split("\n")
      while lines and (not lines[0] or lines[0].isspace()):
          lines.pop(0)
      while lines and (not lines[-1] or lines[-1].isspace()):
          lines.pop()
      for i, line in enumerate(lines):
          lines[i] = line.rstrip()
      string = "\n".join(lines)
      string = textwrap.dedent(string)
      return string
docs: Normalizes whitespace.
  
      Strips leading and trailing blank lines, dedents, and removes trailing
      whitespace from the result.