Is your feature request related to a problem? Please describe.
Check whether a binary tree is symmetric or not.

Describe the solution you'd like

• Recursively check for left and right subtree of root
• 1. left subtrees root's values should be equal right subtree's root value
• 2. recursively check with left subtrees' left child VS right subtree's right child AND
• left subtree's right child VS right subtree left child
  Ex.
  Below is a symmetric tree

                               1
                   /                         \
                 2                           2
         /                \             /             \
      3                    4         4                3

Below is not symmetric because values is different in last level

                               1
                   /                         \
                 2                           2
         /                \             /             \
      3                    5         4                3

Describe alternatives you've considered
Suggested optimal solution

Additional context