Flatten Binary Tree to Linked List

Q:Given a binary tree, flatten it to a linked list in-place.

For example,
Given

1
/ \
2 5
/ \ \
3 4 6
The flattened tree should look like:
1
\
2
\
3
\
4
\
5
\
6
Hints:
If you notice carefully in the flattened tree, each node’s right child points to the next node of a pre-order traversal.

My Answer:
fbt

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