fix Point usage

include/advent_utility.h

@@ -1,19 +1,6 @@
 #ifndef ADVENT_H_UTILITY_
 #define ADVENT_H_UTILITY_
 
-struct Point {
-    int x;
-    int y;
-};
-
-struct Point new_Point(int, int);
-
-struct Point *new_Point_p(int, int);
-
-int same_Point(const struct Point *, const struct Point *);
-
-int same_Point_v(const void *, const void *);
-
 char *md5_str(const char *);
 
 char *capture_system(const char *);