The distance between a node in a Binary Tree and the tree’s root is called the node’s depth.

Write a function that takes in a Binary Tree and returns the sum of all of its subtrees’ nodes’ depths.

Each `BinaryTree`

node has an integer `value`

, a `left`

child node, and a `right`

child node. Children nodes can either be `BinaryTree`

nodes themselves or `None`

/ `null`

.

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