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https://leetcode.com/problems/binary-tree-paths
Given the root of a binary tree, return all root-to-leaf paths in any order.
root
A leaf is a node with no children.
Example 1:
**Input:** root = [1,2,3,null,5] **Output:** ["1->2->5","1->3"]
Example 2:
**Input:** root = [1] **Output:** ["1"]
Constraints:
The number of nodes in the tree is in the range [1, 100].
[1, 100]
-100 <= Node.val <= 100
