show data structure base and link address

tests/test_linkedlist.c

@@ -50,7 +50,7 @@ int main (void)
     size_t test_size = 10;
     for(size_t i = 0; i < test_size; i++) {
         test_data* t = malloc(sizeof(test_data));
-        printf("n = %d allocated data...link at %p...\n", i, &t->link);
+        printf("n = %d allocated data at %p...test_data.link at %p...\n", i, &t, &t->link);
 
         t->data1 = rand() % UINT64_MAX;
         t->data2 = rand() % UINT64_MAX;