input: Write a function to print a jagged array of a given size without any values. If the input size is 4, the output should be [[], [], [], []].
  assert print_jagged_array(4)==[[] for _ in range(4)]
  assert print_jagged_array(0)==[]
  assert print_jagged_array(3)==[[] for _ in range(3)]
  assert print_jagged_array(1)==[[]]
  assert print_jagged_array(2)==[[] for _ in range(2)]
output: def print_jagged_array(size):
      return [[] for _ in range(size)]