>>> from apply_prefix import apply_prefix_modifier

>>> lw1 = ['communication', 'medicine', 'vision', 'phone']
>>> res1 = apply_prefix_modifier (lw1, 'tele')
>>> lw1
['Tele-communication', 'Tele-medicine', 'Tele-vision', 'Tele-phone']
>>> print(res1)
None

>>> lw2 = ['script', 'operative', 'date']
>>> res2 = apply_prefix_modifier (lw2, 'post')
>>> lw2
['Post-script', 'Post-operative', 'Post-date']
>>> print(res2)
None

>>> lw3 = []
>>> res3 = apply_prefix_modifier (lw3, 'des')
>>> lw3
[]
>>> print(res3)
None