I'm leaking!

queue.c

@@ -1,7 +1,10 @@
 #include <assert.h>
+#include <stdio.h>
 #include <stdlib.h>
+
 #include "queue.h"
 
+
 Queue* create_queue() {
   Queue* queue = malloc(sizeof(Queue));
   queue->size = 0;
@@ -23,7 +26,7 @@ int back(Queue* queue) {
 void enqueue(Queue* queue, int data) {
   QueueNode* node = malloc(sizeof(QueueNode));
   node->data = data;
-  node->next = queue->head;
+  node->next = NULL;
   if (is_empty(queue)) {
     queue->head = queue->tail = node;
   } else {
@@ -44,11 +47,22 @@ int dequeue(Queue* queue) {
 }
 
 void destroy_queue(Queue* queue) {
-  return;
+  QueueNode* current = queue->head;
+  while (current) {
+    QueueNode* next = current->next;
+    free(current);
+    current = next;
+  }
+  free(queue);
 }
 
 void print_queue(Queue* queue) {
-  return;
+  QueueNode* current = queue->head;
+  while (current) {
+    printf("%d ", current->data);
+    current = current->next;
+  }
+  printf("\n");
 }
 
 size_t size(Queue* queue) {

queue_test.c

@@ -11,12 +11,12 @@ int test_create_queue() {
   CHECK(assert_equal_int(size(queue), 0));
   CHECK(assert_true(is_empty(queue)));
   destroy_queue(queue);
+
   return 0;
 }
 
 int test_enqueue() {
   Queue* queue = create_queue();
-
   enqueue(queue, 1);
   CHECK(assert_equal_int(size(queue), 1));
   CHECK(assert_false(is_empty(queue)));
@@ -27,31 +27,35 @@ int test_enqueue() {
   CHECK(assert_equal_int(size(queue), 2));
   CHECK(assert_equal_int(front(queue), 1));
   CHECK(assert_equal_int(back(queue), 2));
+  destroy_queue(queue);
+
   return 0;
 }
 
 int test_dequeue() {
- Queue* queue = create_queue();
-
- enqueue(queue, 1);
- dequeue(queue);
- CHECK(assert_true(is_empty(queue)));
-
- for (int i = 1; i <= 10; i++) {
-   enqueue(queue, i);
- }
-
- dequeue(queue);
- dequeue(queue);
- CHECK(assert_equal_int(size(queue), 8));
- CHECK(assert_equal_int(front(queue), 3));
- CHECK(assert_equal_int(back(queue), 10));
- return 0;
+  Queue* queue = create_queue(); 
+  enqueue(queue, 1);
+  dequeue(queue);
+  CHECK(assert_true(is_empty(queue)));
+
+  for (int i = 1; i <= 10; i++) {
+    enqueue(queue, i);
+  }
+
+  dequeue(queue);
+  dequeue(queue);
+  CHECK(assert_equal_int(size(queue), 8));
+  CHECK(assert_equal_int(front(queue), 3));
+  CHECK(assert_equal_int(back(queue), 10));
+  destroy_queue(queue);
+
+  return 0;
 }
 
 int main() {
   run_test("test_create_queue", test_create_queue);
   run_test("test_enqueue", test_enqueue);
   run_test("test_dequeue", test_dequeue);
+
   return 0;
 }