checkit for structs

#include <stdio.h>
#include "checkit.h"

typedef struct
{
   int speed;
   double direction;
} velocity;

velocity increase(velocity alpha)
{
    alpha.speed = alpha.speed + 10;
    alpha.direction = alpha.direction + 1.0;
    return alpha;
}

int main(void)
{
    velocity bravo = {10, 150.0};
    velocity charly;
    charly = increase(bravo);
    checkit_int(charly.speed, 20);
    checkit_double(charly.direction, 151.0);
    return 0;
}