input: def print_star_pattern():
      """ Print the following star pattern:
      *
      **
      ***
      ****
      *****
      ****
      ***
      **
      *
      Example:
      for print_star_pattern() == None (just prints the pattern)
      """
output:     for i in range(1, 6):
          print('*' * i)
      for i in range(4, 0, -1):
          print('*' * i)