Implementation of memmove in C language

One .memmove Introduction to

void* memmove ( void* dest, const void* src, size_t num );

and memcpy The difference is that memmove The source and target memory blocks processed by the function can overlap

If the source space and the target space overlap , Then use memmove Function processing

Two .memmove The implementation of the

#include<stdio.h>
#include<assert.h>
void* my_memmove(void* dest, const void* src, size_t count)
{
	assert(dest && src);
	void* ret = dest;
	if (src > dest)
	{
		while (count--)
		{
			*(char*)dest = *(char*)src;
			(char)dest += 1;
			(char)src += 1;
		}
	}
	else
	{
		while (count--)
		{
			*((char*)dest + count) = *((char*)src + count);
		}
	}
	return ret;
}

void test_my_memmove()
{
	int a[] = { 1,2,3,4,5,6,7,8,9,10 };
	my_memmove(a, a+2, 20);
	//my_memmove(a+2, a, 20);
	for (int i = 0; i < 10; i++)
	{
		printf("%d ", a[i]);
	}
	printf("\n");
}
int main()
{
	test_my_memcpy();
	return 0;
}