add exercise zebra-puzzle

[siebenschlaefer]

Feel free to criticize anything, big or small.

[ryanplusplus]

This is really slick! This is my first time seeing a solution to this exercise.

[wolf99]

I feel like there may be some way to implement a large part of this with x macros. But I can't see it well enough on mobile to know for sure

[wolf99]

Why solve the same problem twice?
Is it possible to solve it once and then just query the results (possibly in some generic way) ?

[ryanplusplus]

Do you mean to take an object oriented approach to the exercise where solving and querying the solution are separate steps?

[siebenschlaefer]

I agree, and don't like it either.
I was under the impression that these two separate functions would be a what the author of the problem-specification intended, with the two "properties" drinksWater and ownsZebra.
I looked at the C# version where those are two static methods and the Python version where those are two free functions.

But now that you asked I dug a little further and found the Go version that has a single function SolvePuzzle() which I like more.

I could change the code to something like

struct solution
{
   const char *drinks_water;
   const char *owns_zebra;
};

struct solution solve_puzzle(void);