https://leetcode.com/contest/weekly-contest-73/problems/rotated-digits/
Quite Straight Forward,
in case of 25, 69 they change to something beautiful.
in case of 0, 1, 8, they just don't mean anything,
in case of the 3, 4, 7 they are pretty much deal breaker.
the conditions are messy so I speed them up with an array.
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