Daily Coding Problem: Problem #977 [Easy]

Good morning! Here's your coding interview problem for today.

This problem was asked by Microsoft.

Implement a URL shortener with the following methods:

• shorten(url), which shortens the url into a six-character alphanumeric string, such as zLg6wl.
• restore(short), which expands the shortened string into the original url. If no such shortened string exists, return null.

Hint: What if we enter the same URL twice?

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