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.
Remove white space from the string
Sum the Digits of a Number
Create an 'arrow-head" matrix
Is this triangle right-angled?
Parse me a Lisp
Read a Soroban Abacus
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
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