Flatten binary tree in order of post-order traversal

Here given code implementation process.
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1) Flatten binary tree in order of postorder traversal in java
2) Flatten binary tree in order of postorder traversal in c++
3) Flatten binary tree in order of postorder traversal in c
4) Flatten binary tree in order of postorder traversal in golang
5) Flatten binary tree in order of postorder traversal in c#
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7) Flatten binary tree in order of postorder traversal in php
8) Flatten binary tree in order of postorder traversal in node js
9) Flatten binary tree in order of postorder traversal in python
10) Flatten binary tree in order of postorder traversal in ruby
11) Flatten binary tree in order of postorder traversal in scala
12) Flatten binary tree in order of postorder traversal in swift
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