rem: a->pcnt, b->pcnt answer->pcnt);
add: a->pcnt, b->pcnt, answer->pcnt);
context: subtract_counters(STRUCT_COUNTERS *answer,		  const STRUCT_COUNTERS *a,		  const STRUCT_COUNTERS *b){	answer->pcnt = a->pcnt - b->pcnt;	answer->bcnt = a->bcnt - b->bcnt;	fprintf(stderr, "pcnt: %llu - %llu = %llu\n",		a->pcnt, b->pcnt answer->pcnt);	fprintf(stderr, "bcnt: %llu - %llu = %llu\n",		a->bcnt, b->bcnt answer->bcnt);}