docs: def start(st_reg_number):
      """Checks the number valiaty for the Sergipe state"""
      divisor = 11
  
      if len(st_reg_number) > 9:
          return False
  
      if len(st_reg_number) < 9:
          return False
  
      sum_total = 0
      peso = 9
  
      for i in range(len(st_reg_number)-1):
          sum_total = sum_total + int(st_reg_number[i]) * peso
          peso = peso - 1
  
      rest_division = sum_total % divisor
      digit = divisor - rest_division
  
      if digit == 10 or digit == 11:
          digit = 0
  
      return digit == int(st_reg_number[len(st_reg_number)-1])