walker.c

int *get_move()
{
    const int moves[4][2] = {
        { 1,  0}, // North
        { 0,  1}, // East
        {-1,  0}, // South
        { 0, -1}  // West
    };

    int move;
    srand((unsigned) time(NULL));
    move = rand() % 4;
    return moves[move];
}