input: def print_star_pattern():
      """ Prints a pattern of stars that increases from 1 to 5 and then decreases back to 1.
      >>> print_star_pattern()
      *
      **
      ***
      ****
      *****
      ****
      ***
      **
      *
      """
      for i in range(5):
          for j in range(i+1):
              print("*", end="")
          print("")
  
      for i in range(5, 0, -1):
          for j in range(i):
              print("*", end="")
          print("")
output:     for i in range(4, 0, -1):
          for j in range(i):
              print("*", end="")
          print("")