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Min and Max

Some of the simpler BST algorithms are the get_min and get_max methods.

Assignment

Now that we can add users to our BST, our systems team wants us to start implementing search functionality.

Implement the get_min and get_max methods. They should return the minimum and maximum values in the BST respectively.

The get_min function loops through all the left child nodes and returns the value of the last one.
The get_max function does the same for the right children.