实现memcopy函数

实现memcopy函数：

 void * memcpy(void *dest, const void *src, unsigned int count);
 {
     if ((src == NULL) || (dest == NULL))
         return NULL;

     while (count--)
         *dest++ = *src++;

     return dest;
 }

https://blog.csdn.net/goodwillyang/article/details/45559925

https://blog.csdn.net/souprock/article/details/78179324