code: def advance_past_chars(self, chars):
          
          start_index = self.index
          while True:
              current_char = self.raw_text[self.index]
              self.index += 1
              if current_char in chars:
                  break
  
              elif self.index == self.len:
                  break
  
          return self.raw_text[start_index : self.index - 1]
docs: Advance the index past specific chars
          Args chars (list): list of characters to advance past
  
          Return substring that was advanced past