input: Write a function to construct a nested loop in Python that prints out the elements of the given input arrays in the specified format. The function should iterate through each element of the first array, then the second array, and finally the third array, printing each combination on a new line.
  assert nested_loop_print([1,2,3], [4,5,6], [7,8,9])==None
  assert nested_loop_print([1,1,1], [2,2,2], [3,3,3])==None
  assert nested_loop_print([1], [2], [3])==None
  assert nested_loop_print([], [], [])==None
  assert nested_loop_print([1,2], [3,4], [5,6])==None
output: def nested_loop_print(arr1, arr2, arr3):
      for i in arr1:
          for j in arr2:
              for k in arr3:
                  print(i, j, k)