rework: changed to basic implementation for dijkstra

src/graph.c

@@ -4,19 +4,15 @@
 #include <stdint.h>
 
 struct Vertex {
-    void *data;
     ArrayList *edges;
 };
 
 struct Edge {
-    size_t *to;
-    intmax_t weight;
+    size_t to;
+    size_t weight;
 };
 
 struct Graph {
     ArrayList *vertices;
     GraphType type;
-    
-    int (*cmp)(const void*, const void*);
-    void (*free_data)(void*);
 };