changed pointer name

cars_1.c

@@ -9,8 +9,8 @@
 #define crosses 100000
 int car_on_bridge = 0;
 
-void* func(void* arg){
-    int car_id = *(int*)arg;
+void* func(void* ptr){
+    int car_id = *(int*)ptr;
     int crosses_counter = 0;
     while (crosses_counter < crosses){
         while (car_on_bridge == 1){