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.
Knight's Tour Checker
Least common multiple of many numbers
Back to basics 1 - Saving
Replace Vector Elements
Reverse the elements of an array
Inhomogenous Depth Scale Interpolation
Generalized N-Cards Problem
Check to see if a Sudoku Puzzle is Solved
N-Dimensional Array Slice
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