Update Stringfun.c

WEEK-2/Stringfun.c

@@ -10,6 +10,8 @@
 
 // TODO: #1 What is the purpose of providing prototypes for
 //          the functions in this code module
+//ANSWER #: Before the functions are implemented, prototypes inform the compiler of their names,
+//parameters, and return types, which helps to ensure proper usage.
 void  usage(char *);
 int   count_words(char *);
 void  reverse_string(char *);