Convert binary tree to its Sum tree.

### Related Posts:

- Convert binary tree to its Sum tree
- Convert BST to Greater Sum Tree
- Given a binary tree, Convert it into its Mirror Tree
- Convert Binary Tree into Threaded Binary Tree
- Given a Sorted Singly Linked List Array, Convert it into a Balanced Binary search Tree.
- Check If One Binary is Mirror Tree of another Binary Tree.
- Find the Size of a Binary Tree without Recursion
- Find the Size of the Binary Tree
- Reverse Alternate levels of a given Binary Tree.
- Algorithms — Linked List Problems