cook language test for appending atom to it's list in compound.
#include <stdio.h>
#include "CookCompound.h"
int main(int argc, char const *argv[]) {
CookCompound cc;
CookCompound* ccp = &cc;
CookAtomList_append(ccp->atoms + CookElem_int, CookAtom_new_int(4));
printf("len of ints is %d\n", CookCompound_LEN(ccp, CookElem_int));
return 0;
}