Update primer.md

For consistency and readability: the test below uses nullptr not NULL.
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segsch 2024-08-13 22:19:39 +03:00 committed by GitHub
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@ -261,7 +261,7 @@ class Queue {
public:
Queue();
void Enqueue(const E& element);
E* Dequeue(); // Returns NULL if the queue is empty.
E* Dequeue(); // Returns nullptr if the queue is empty.
size_t size() const;
...
};