I could understand while using loop counter. but I can t solve with pointer arithmetic.

please help me with pointer arithmetic and write in C language and run in VM that I could check

myself's. Thanks

Exercise 3.15. Write a function whisper that changes every uppercase letter to a lowercase letter. It should implement the following specification: 1 Write s the message of ms g In int o ms g Out, ezcept with a Li 2 i o wiercas e letters Returns 0 if successful and 1 if 3 either of m s g In or ms gout is NULL 5 int whisper char ms gIn, char msgout Illustrate several critical memory configurations of an execution of whisper from a context similar to the main function above