2. (5 pts) Write/Implement a function definition for a function mystrncat () with the following header: char *mystrncat (char *destination, const char *source, int n ) This function appends no more than n characters from the string pointed to by source to the end of the string pointed to by destination. The null character is appended to the end of the result. If the length of the C string in source is less than n, then only the content up to the terminating null character is copied. The destination pointer is returned. NOTE: you must use pointer arithmetic and notation in your definition