fix: dont copy unset map nodes

map.c

@@ -19,7 +19,7 @@ typedef struct MapNode_struct {
     int value;
 } MapNode;
 
-struct _Map {
+struct Map_struct {
     MapNode *nodes;
     uint32_t size;
     uint32_t capacity;
@@ -126,15 +126,16 @@ __inline void map_ensure_capacity(Map *map) {
         for(int i = 0; i < capacity; i++) {
             MapNode node = nodes[i];
             MapNode *next = node.next;
+            if(next == NULL) {
+                continue;
+            }
             map_set_node(map, node);
-            if(next != NULL) {
-                while((size_t) next != UINTPTR_MAX) {
-                    map_set_node(map, *next);
-                    MapNode *after = next->next;
-                    assert(after != NULL);
-                    free(next);
-                    next = after;
-                }
+            while((size_t) next != UINTPTR_MAX) {
+                map_set_node(map, *next);
+                MapNode *after = next->next;
+                assert(after != NULL);
+                free(next);
+                next = after;
             }
         }
         free(nodes);