Flatten binary tree in order of post-order traversal

In computer science and data structures, a binary tree is a tree data structure in which each node has at most two children, referred to as the left child and the right child. The post-order traversal of a binary tree visits the nodes in the order: left subtree, right subtree, root.

"Flattening" a binary tree refers to the process of converting the binary tree into a linear structure such as an array or a list while preserving the order of the nodes in the post-order traversal. This is typically done by recursively traversing the left and right subtrees and appending them to a result list before appending the root node.

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