feat: add day 4

list.h

@@ -37,8 +37,7 @@ static __inline LIST_NAME* LIST_FN(create)(int capacity) {
 
 static __inline void LIST_FN(add)(LIST_NAME *alist, ELEMENT_TYPE value) {
     if(alist->length >= alist->capacity) {
-        alist->data = realloc(alist->data, alist->capacity * 2);
-        alist->capacity = alist->capacity * 2;
+        alist->data = realloc(alist->data, sizeof (ELEMENT_TYPE) * (alist->capacity *= 2));
     }
 
     alist->data[alist->length++] = value;