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Given a binary tree. Find the inorder traversal of the tree **without using recursion**.

**Example 1**

Input:1/ \2 3 / \ 4 5Output:4 2 5 1 3Explanation:Inorder traversal (Left->Root->Right) of the tree is 4 2 5 1 3.

**Example 2**

Input:8 / \ 1 5 \ / \ 7 10 6 \ / 10 6Output:1 7 10 8 6 10 5 6Explanation:Inorder traversal (Left->Root->Right) of the tree is 1 7 10 8 6 10 5 6.

You don't need to read input or print anything. Your task is to complete the function **inOrder() **which takes the root of the tree as input and returns a list containing the inorder traversal of the tree, calculated** without using recursion.**

**Expected time complexity: **O(N)

**Expected auxiliary space: **O(N)

1 <= Number of nodes <= 10^{5}

1 <= Data of a node <= 10^{5}

1 <= Data of a node <= 10

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Inorder Traversal (Iterative)

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