please help me，about Code implementation problem

[hopeyl]

static joinAlg algs[] { {"HJC", hashJoinClusteredProbe}			//定义了一些参数和连接探测函数
//		{"HJ", hashIndexJoin}
};

		case 'a': {										
			int i = 0;
			while (algs[i].joinAlg) {
				printf("\noptarg = %s,algs[i].name=%s\n",optarg,algs[i].name);
				if (strcmp(optarg, algs[i].name) == 0){
					printf("\noptarg = %s,algs[i].name=%s\n",optarg,algs[i].name);
					fflush(stdout);
					strcpy(input->alg.name, algs[i].name);
					input->alg.joinAlg = algs[i].joinAlg;
					break;
				}
				i++;
			}
			printf("joinAlg = %s\t", input->alg.name);
		}
			break;

Here's why “HJ” and “HJC” were able to match.