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.
Extract leading non-zero digit
Twins in a Window
Back to basics 17 - white space
Implement simple rotation cypher
Lychrel Number Test (Inspired by Project Euler Problem 55)
N-Dimensional Array Slice
Great Circle Distance
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