>>> from p3 import energy

>>> lkw1 = [600, 700, 850]
>>> r = energy(lkw1)
>>> print(r)
None
>>> lkw1
[100, 150, 0]

>>> lkw2 = [502, 499, 725, 852, 840, 1010, 999, 1020]
>>> r = energy(lkw2)
>>> print(r)
None
>>> lkw2
[-3, 226, 127, -12, 170, -11, 21, 0]

>>> lkwh3 = [321, 398, 350, 560, 489, 670, 702, 756, 765]
>>> r = energy(lkwh3)
>>> print(r)
None
>>> lkwh3
[77, -48, 210, -71, 181, 32, 54, 9, 0]