input: Write a function to construct a nested loop in Python to print out the elements of the given arrays in a new line. The function should take a list of arrays as input.
  assert construct_nested_loop([[1,2,3], [4,5,6], [7,8,9]])==None
  assert construct_nested_loop([[10,11], [12,13], [14,15]])==None
  assert construct_nested_loop([])==None
output: def construct_nested_loop(arrays):
      for array in arrays:
          for element in array:
              print(element)