模拟实现memmove

//模拟实现memmove
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <assert.h>
void* my_memmove(void* dest,const void* src, size_t num)
{   
	assert(dest && src);
	void* p = dest;
	if (dest < src)
	{
		//前向后
		while (num--)
		{
			*(char*)dest = *(char*)src;
			dest = (char*)dest + 1;
			src = (char*)src + 1;
		}
	}
	else
	{
		//后向前
		while (num--)
		{
			*((char*)dest+num) = *((char*)src+num);
		}
	}
	return p;
}
int main()
{   
	int arr[] = { 1,2,3,4,5,6,7,8,9,10 };
	my_memmove(arr,arr+2,20);
	for (int i = 0;i < 10;i++)
	{
		printf("%d ", arr[i]);
	}
	return 0;
}