用C语言编写一段程序，模拟存储管理中利用链表结构进行循环首次适应法的内存分配与释放操作：首先用系统函数malloc在内存中申请一块大小为1000字节的空间，然后通过输入命令完成此块内存中的分区分配与回收算法，要求在屏幕上给出必要的结果显示。-Write a program using C language to simulate the use of list storage management cycle of the structure of first-fit memory allocation and release of the law steps: first using the system malloc function in memory for a size of 1000 bytes of space, and then enter the command to complete This block of memory partition allocation and recovery algorithms, require on the screen give the necessary results.