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.
Maximum running product for a string of numbers
Back to basics 17 - white space
Back to basics 22 - Rotate a matrix
Simple equation: Annual salary
Side of a rhombus
Return the first and last character of a string
Lychrel Number Test (Inspired by Project Euler Problem 55)
Specific Element Count
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