fix: updating arraylist sintaxis

src/main.c

@@ -25,7 +25,8 @@ int main(void) {
     // no need to destroy if this is all the programm,
     // in any other case destroy IS needed for memory
     // leaks :)
-    ArrayList *arr = arraylist_init(ARR_SIZE, sizeof(int));
+    ArrayList *arr;
+    arraylist_init(&arr, ARR_SIZE, sizeof(int));
 
     if (arr == NULL) {
         puts("El arreglo no pudo ser inicializado.");