diff --git a/TP/TP1/rendu/linked_list.c b/TP/TP1/rendu/linked_list.c
index 0fdc670..cb57aa9 100644
--- a/TP/TP1/rendu/linked_list.c
+++ b/TP/TP1/rendu/linked_list.c
@@ -29,7 +29,7 @@ void insertFirst(linkedList *list, int key, void *data) {
 
 //delete first item
 node* deleteFirst(linkedList *list) {
-    if (list->head == NULL) {
+    if (!list->head) {
         return NULL;
     }
 
@@ -50,7 +50,7 @@ node* find(linkedList *list, int key) {
     node* current = list->head;
 
     //if list is empty
-    if(list->head == NULL) {
+    if(!current) {
         return NULL;
     }
 
@@ -58,7 +58,7 @@ node* find(linkedList *list, int key) {
     while(current->key != key) {
 	
         //if it is last node
-        if(current->next == NULL) {
+        if(!current->next) {
             return NULL;
         } else {
             //go to next link
@@ -78,7 +78,7 @@ node* deleteElement(linkedList *list, int key) {
     node* previous = NULL;
 	
     //if list is empty
-    if(list->head == NULL) {
+    if(!list->head) {
         return NULL;
     }
 
@@ -86,7 +86,7 @@ node* deleteElement(linkedList *list, int key) {
     while(current->key != key) {
 
         //if it is last node
-        if(current->next == NULL) {
+        if(!current->next) {
             return NULL;
         } else {
             //store reference to current link
@@ -110,7 +110,7 @@ node* deleteElement(linkedList *list, int key) {
 
 //is list empty
 bool isEmpty(linkedList *list) {
-    return list->head == NULL;
+    return !list->head;
 }
 
 int length(linkedList *list) {