Implement the method tostring for the class binarysearchtree

Implement the method toString for the class BinarySearchTree. The method should return a string that, when displayed, shows the shape of the tree in two dimensions. Ignore the data in each node. For example a tree might appear as follows:
1537_b0d9513f-9d65-41c9-9484-2c0080ef173e.png

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