add exercise crypto square #68
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I'm with you on not checking intermediate steps. It's one of the things that I go back-and-forth with in Ruby, but have stayed with intermediate steps for now since it seems like there are more early learners on that track. |
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Required API is a single function Encode(string) string. Intermediate results are not checked as with the Ruby tests; this leaves the solver more freedom in implementation. A couple tests added around square boundary conditions but otherwise no additions or changes.