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.
Tic Tac Toe FTW
Back to basics 2 - Function Path
Change the sign of even index entries of the reversed vector
Insert zeros into vector
Read a Soroban Abacus
Guess the Coefficients!
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