Write function char *strupper(char *s) which converts lower case letters in string s to upper case and returns a pointer the first character in the converted string. All other characters remain unchanged. The imple- mentation must be basedon a for-loop and pointers (no array indexing).

Hint: Since pointer s must be returned, have the for-loop declare and initialize another pointer with dereferencing andincrementing thereof constituting the rest of the loop logic.