Grokking Tree Coding Patterns for Interviews
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Verify Preorder Serialization of a Binary Tree (medium)
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Problem Statement

You are given a string called preorder that represents the serialization of a binary tree.

This serialization string is created using a preorder traversal, where each node's value is recorded if it is a non-null node. Otherwise, we record using a sentinel value such as '#'.

The string preorder contains only integers and the character '#', separated by commas. The format is always valid, so there will be no cases like two consecutive commas (e.g., "1,,4").

Return true, if this string is a valid serialization of a binary tree. Otherwise, return false

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