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.
Is my wife right?
Project Euler: Problem 8, Find largest product in a large string of numbers
Reverse a matrix
length of a vector
Check to see if a Sudoku Puzzle is Solved
Recurring Cycle Length (Inspired by Project Euler Problem 26)
Solve the Sudoku Row
Test if two numbers have the same digits
Set a Soroban Abacus
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