Utilities下，BinaryTree.h和BinaryTree.cpp中的DestroyTree()参数要加引用 #29
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void DestroyTree(BinaryTreeNode*& pRoot);函数中对指针进行了修改，并希望保存，所以要加上&。否则修改的结果不生效，成为野指针。
void DestroyTree(BinaryTreeNode*& pRoot)函数中会对指针进行修改。加上引用，修改才能生效，否则成为野指针，无法达到销毁树的目的。
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Utilities下，BinaryTree.h和BinaryTree.cpp中的void DestroyTree(BinaryTreeNode* pRoot)参数要加引用，即改为void DestroyTree(BinaryTreeNode*& pRoot)。
因为对指针有释放内存，并赋值为nullptr。只有加上引用，赋值才能生效。否则会成为野指针。