Problem of the Day
A new programming or logic puzzle every Mon-Fri

Today's goal is to take in a binary tree and flatten it into a linked list as shown below. Can you solved this in place (without creating a new linked list)?

    1
   / \
  2   5
 / \   \
3   4   6

1
 \
  2
   \
    3
     \
      4
       \
        5
         \
          6

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