Free task memory after completion (#23)

Previously, tasks were allocated using malloc but never freed, causing
memory leaks. Added deallocation after task completion in task0 and
task1 prevent memory leaks.

Author: charliechiou

coro/coro.c

@@ -104,6 +104,7 @@ void task0(void *arg)
     }
 
     printf("%s: complete\n", task->task_name);
+    free(task);
     longjmp(sched, 1);
 }
 
@@ -135,6 +136,7 @@ void task1(void *arg)
     }
 
     printf("%s: complete\n", task->task_name);
+    free(task);
     longjmp(sched, 1);
 }