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.
Sort numbers by outside digits
Duplicate each element of a vector.
Symmetry of vector
06 - Matrix Equations 2
Reverse a matrix
Return the first and last character of a string
Parse me a Lisp
Give the Shortest Path Through The Maze
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