完成并修改正确必做题

exp1/task61.c

@@ -31,7 +31,7 @@ void *wokerT3(void *vargp)
     for(int i=0; i<5; i++)
     {
         time_t t = time(NULL);
-        printf("Current time %s\n",ctime(&t));
+        printf("Current time %s",ctime(&t));
         int sleep_time = rand() % 5 + 1;
         sleep(sleep_time);
     }