Question: / / remove all nodes that have only one child by promoting that child / / repeat this recursively as you go up , so

// remove all nodes that have only one child by "promoting" that child
// repeat this recursively as you go up, so the final result should have no nodes with only one child
// if you start with "41", the tree is unchanged.
// if you start with "412161", the tree is unchanged.
// if you start with the BST "4121111", then the result is the tree "1"
// if you start with the BST "41216111", then the result is the tree "411161"
// Hint: This requires that you check for "singleness" after the recursive calls

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