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Add all the node values in a Binary Tree or Sum of a Binary tree
- Given a binary tree root node, return the sum of all the nodes of the tree.
- The total sum is calculated by recursively adding the value of the current node, the sum of the left subtree, and the sum of the right subtree.
- If the root node is null, the sum is 0.
- The sum of all the nodes in the binary tree is returned.
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