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.
Encode Roman Numerals
Calculate the Levenshtein distance between two strings
Sophie Germain prime
Sum the Digits of a Number
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Give the Shortest Path Through The Maze
Number of 1s in the Binary Representation of a Number
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