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Make the code base clean under -Wwrite-strings.
I've also added that warning option and -Werror to the build script, so that I'll find out if I break this property in future.
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@ -738,7 +738,8 @@ static char *solve_game(const game_state *state, const game_state *currstate,
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int *unvisited;
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int circuitlen, circuitsize;
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int head, tail, pass, i, j, n, x, y, d, dd;
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char *err, *soln, *p;
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const char *err;
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char *soln, *p;
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/*
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* Before anything else, deal with the special case in which
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