newby qn about functions

[Cathy James]

 #This has to be very simple, but I don't get it-please help

def *lower_case*(s):

    #return s

    print(s)

    #return s.lower()

    print(s.lower())

s=*"Testing Functions-lower case: "
*

lower_case(s)
*"""how can i use a return statement  to write a function that returns the
string "Testing Functions-lower case: "and the lowercase representation of
its string parameter""" If I uncomment the above, nothing outputs to
console:(*
**
*Much appreciation as always.*
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