Given a number, return the number of closed 'circles' in the base 10 numerical representation.
Note: the number 4 has no circles
8819 -> 5
Interpolating on a string (the ASCII values) is an interesting idea even though the long interpolation string could be reduced by subtracting '0', but at the expense of a "longer" solution.
Connect Four Win Checker
Knight's Tour Checker
Volume of this donut
letter yes yes & letter no no
Pig Latin to English Translator
English to Pig Latin Translator
Triangle Numbers Below N
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