Implemented that each road, node in managers will be stored as pointers (allocated in heap)

src/simulator.zig

@@ -56,6 +56,7 @@ pub const Simulator = struct {
         };
 
         if (self.node_man.temp_node) |temp| {
+            if (temp.*.id == cur_node.*.id) return;
             self.road_man.addRoad(self.allocator, temp, cur_node) catch |err| {
                 std.debug.panic("Failed to add a new road or assigning its nodes: {}\n", .{err});
             };
@@ -68,7 +69,7 @@ pub const Simulator = struct {
     }
 
     fn clear(self: *Simulator) void {
-        self.road_man.clear();
+        self.road_man.clear(self.allocator);
         self.node_man.clear(self.allocator);
     }
 };