docs: def start(st_reg_number):
      """Checks the number valiaty for the Minas Gerais state"""
      #st_reg_number = str(st_reg_number)
      number_state_registration_first_digit = st_reg_number[0:3] + '0' + st_reg_number[3: len(st_reg_number)-2]
      weights_first_digit = [1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2]
      wights_second_digit = [3, 2, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2]
      first_digit = st_reg_number[-2]
      second_digit = st_reg_number[-1]
      sum_first_digit = 0
      sum_second_digit = 0
      sum_result_digit = ''
      sum_end = 0
  
      if len(st_reg_number) != 13:
  
          return False
  
      for i in range(0, 12):
  
          sum_first_digit = weights_first_digit[i] * int(number_state_registration_first_digit[i])
  
          sum_result_digit = sum_result_digit + str(sum_first_digit)
  
      for i in range(0, len(sum_result_digit)):
  
          sum_end = sum_end + int(sum_result_digit[i])
  
      if sum_end % 10 == 0:
  
          check_digit_one = 0
  
      elif sum_end < 10:
  
          check_digit_one = 10 - sum_end
  
      elif sum_end > 10:
  
          check_digit_one = (10 - sum_end % 10)
  
      if str(check_digit_one) != first_digit:
  
          return False
  
      number_state_registration_second_digit = st_reg_number + str(check_digit_one)
  
      for i in range(0, 12):
  
          sum_second_digit = sum_second_digit + wights_second_digit[i] * int(number_state_registration_second_digit[i])
  
      check_second_digit = 11 - sum_second_digit % 11
  
      if sum_second_digit == 1 or sum_second_digit == 0:
  
          return second_digit == '0'
  
      else:
          return str(check_second_digit) == second_digit