Binary Tree Distance between Two Nodes

Find the Distance between Two Nodes of a Binary Tree.

Latest Source Code:
Github: BinaryTreeDistanceBetweenTwoNodes.java

Output:

        A               
      / \       
     /   \      
    /     \     
   /       \    
   B       C       
  / \     / \   
 /   \   /   \  
 D   E   F   G   
      \         
      H         
                                
Distance between nodes 'D' - 'E' : 2
Distance between nodes 'D' - 'H' : 3
Distance between nodes 'D' - 'G' : 4
Distance between nodes 'D' - 'B' : 1
Distance between nodes 'D' - 'A' : 2