diff --git a/c-the-hard-way/exercises/33/liblcthw/Makefile b/c-the-hard-way/exercises/33/liblcthw/Makefile
index edbb5ce..4de84ed 100644
--- a/c-the-hard-way/exercises/33/liblcthw/Makefile
+++ b/c-the-hard-way/exercises/33/liblcthw/Makefile
@@ -1,4 +1,6 @@
-CFLAGS=-g -O2 -Wall -Wextra -Isrc -rdynamic -DNDEBUG $(OPTFLAGS)
+CC=clang
+#CFLAGS=-g -O2 -Wall -Wextra -Isrc -rdynamic -DNDEBUG $(OPTFLAGS)
+CFLAGS=-g -O2 -Wall -Wextra -Isrc -rdynamic $(OPTFLAGS)
 
 LIBS=-ldl $(OPTLIBS)
 PREFIX?=/usr/local
diff --git a/c-the-hard-way/exercises/33/liblcthw/src/lcthw/dbg.h b/c-the-hard-way/exercises/33/liblcthw/src/lcthw/dbg.h
index 6bee036..acfe0a4 100644
--- a/c-the-hard-way/exercises/33/liblcthw/src/lcthw/dbg.h
+++ b/c-the-hard-way/exercises/33/liblcthw/src/lcthw/dbg.h
@@ -8,7 +8,7 @@
 #ifdef NDEBUG
 #define debug(M, ...)
 #else
-#define debug(M, ...) fprintf(stderr, "DEBUG %s:%d: " M "\n",\
+#define debug(M, ...) fprintf(stderr, "[DEBUG] %s:%d: " M "\n",\
 		__FILE__, __LINE__, ##__VA_ARGS__)
 #endif
 
diff --git a/c-the-hard-way/exercises/33/liblcthw/src/lcthw/list.c b/c-the-hard-way/exercises/33/liblcthw/src/lcthw/list.c
index 5e9b0be..b5c3b00 100644
--- a/c-the-hard-way/exercises/33/liblcthw/src/lcthw/list.c
+++ b/c-the-hard-way/exercises/33/liblcthw/src/lcthw/list.c
@@ -134,9 +134,10 @@ List_Remove(List * list, ListNode * node)
 }
 
 void
-List_Print(List * list)
+List_Print(List * list, const char *message)
 {
 	check(list, "List is NULL");
+	log_info("%s", message);
 	LIST_FOREACH(list, first, next, current)
 	{
 		log_info("Node [%p] - value: %s -- prev [%p] <- * -> next [%p]", current, (char *)current->value, current->prev, current->next);
diff --git a/c-the-hard-way/exercises/33/liblcthw/src/lcthw/list.h b/c-the-hard-way/exercises/33/liblcthw/src/lcthw/list.h
index a7a9781..425fc4f 100644
--- a/c-the-hard-way/exercises/33/liblcthw/src/lcthw/list.h
+++ b/c-the-hard-way/exercises/33/liblcthw/src/lcthw/list.h
@@ -51,7 +51,7 @@ void *
 List_Remove(List * list, ListNode * node);
 
 void
-List_Print(List * list);
+List_Print(List * list, const char *);
 
 #define LIST_FOREACH(L, S, M, V) ListNode *_node = NULL;\
 												   ListNode *V = NULL;\
diff --git a/c-the-hard-way/exercises/33/liblcthw/src/lcthw/list_algos.c b/c-the-hard-way/exercises/33/liblcthw/src/lcthw/list_algos.c
index c9549bd..caea28c 100644
--- a/c-the-hard-way/exercises/33/liblcthw/src/lcthw/list_algos.c
+++ b/c-the-hard-way/exercises/33/liblcthw/src/lcthw/list_algos.c
@@ -13,29 +13,39 @@ ListNode_Swap(ListNode *n1, ListNode *n2)
 int
 List_bubble_sort(List *list, List_compare list_compare_function)
 {
+	int result = -1;
 	if (list && list_compare_function)
 	{
 		ListNode *node_one = list->first;
 		ListNode *node_two = node_one->next; 
-
 		int i;
 		int j;
 		for (i = 0; i < list->count; i++)
 		{
+			node_one = list->first;
+			node_two = node_one->next;
 			for (j = 0; j < list->count - i - 1; j++)
 			{
-				if (list_compare_function(node_one, node_two))
+				// check if node_one value is greater than node_two value
+				if (list_compare_function(node_one, node_two) == 1)
 				{
-					//swap(node_one, node_two);
+					ListNode_Swap(node_one, node_two);
 				}
+				node_one = node_two;
+				node_two = node_one->next;
 			}
 		}
+		result = 0;
 	}
-	return -1;
+	return result;
 }
 
 List *
 List_merge_sort(List *list, List_compare list_compare_function)
 {
+	if (list && list_compare_function)
+	{
+		return list;
+	}
 	return NULL;
 }
diff --git a/c-the-hard-way/exercises/33/liblcthw/tests/list_algos_tests.c b/c-the-hard-way/exercises/33/liblcthw/tests/list_algos_tests.c
index 1fc4b93..c108b4d 100644
--- a/c-the-hard-way/exercises/33/liblcthw/tests/list_algos_tests.c
+++ b/c-the-hard-way/exercises/33/liblcthw/tests/list_algos_tests.c
@@ -38,10 +38,13 @@ test_bubble_sort()
 {
 	List *words = create_words();
 
-	List_Print(words);
+	List_Print(words, "Before Bubble Sort");
 
 	// should work on a list that needs sorting
 	int rc = List_bubble_sort(words, (List_compare) strcmp);
+
+	List_Print(words, "After Bubble Sort");
+
 	mu_assert(rc == 0, "Bubble sort failed.");
 	mu_assert(is_sorted(words), "Words are not sorted after bubble sort.");
 
diff --git a/c-the-hard-way/exercises/33/liblcthw/tests/minunit.h b/c-the-hard-way/exercises/33/liblcthw/tests/minunit.h
index 22fba08..fb9b7e5 100644
--- a/c-the-hard-way/exercises/33/liblcthw/tests/minunit.h
+++ b/c-the-hard-way/exercises/33/liblcthw/tests/minunit.h
@@ -15,7 +15,6 @@
 	message = test(); tests_run++; if (message) return message;
 
 #define RUN_TESTS(name) int main(int argc, char *argv[]) {\
-	argc = 1; \
 	debug("----- RUNNING: %s", argv[0]);\
 	printf("-----\nRUNNING: %s\n", argv[0]);\
 	char *result = name();\