Label binary tree with inorder traversal using Haskell

Label binary tree with inorder traversal using Haskell

code: https://gist.github.com/evgenii-malov/e1e6dc42de3278833bcb61b9af0639df

inorder traversal index function - https://www.youtube.com/watch?v=pIrRiF63ta8 classical inorder traversal - https://www.youtube.com/watch?v=sv9y04GHvmY ... https://www.youtube.com/watch?v=LvCxoV1C2uc