_kt_compare_strings
test = _kt_compare_strings(kt->table[mid].keyseq, kt->table[mid].nc,
_kt_compare_strings(kt->table[*last].keyseq, nc, binary_keyseq, nc)==0) {
_kt_compare_strings(kt->table[*last+1].keyseq, nc, binary_keyseq, nc)==0)
static int _kt_compare_strings(const char *s1, int n1, const char *s2, int n2);