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Given A binary Tree. Your task is to remove all the half nodes (which has only one child).

**Example 1:**

**Input:**
7
/ \
7 8
/
2**
Output: **2 7 8

**Example 2:**

**Input:**
2
/ \
7 5
\ \
9 1
/ \
11 4**
Output: **1 6 11 2 4

**Your Task:**

You don't need to read input or print anything. Your task is to complete the function **removeHalfNodes()** which takes the root node of the tree as input and returns the root node of the modified tree after removing all the half nodes, ie the ones having just a single child node. (The inorder traversal of the returned tree is printed by the driver's code.)

For example consider the below tree.

Nodes 7, 5 and 9 are half nodes as one of their child is Null. We need to remove all such half nodes and return the root pointer of following new tree.

**Expected Time Complexity: **O(N).

**Expected Auxiliary Space: **O(Height of the Binary Tree).

**Constraints:**

1<=Number of nodes<=10^{4}

**Note:**The **Input/Ouput** format and **Example** given are used for system's internal purpose, and should be used by a user for **Expected Output** only. As it is a function problem, hence a user should not read any input from stdin/console. The task is to complete the function specified, and not to write the full code.

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Remove Half Nodes

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