c语言模拟实现strlen函数

#include <stdio.h>
#include<assert.h> 
char*my_strcpy(char* destination,const char*source)
{
	assert(destination!=NULL);
	assert(source!=NULL);
	char* ret=destination;
	while(*destination++=*source++)
	{       ;
	}
	return ret;
}

int main()
{
	char arr1[]={"abde"};
	char arr2[]={"abd"};
	my_strcpy(arr1,arr2);
	printf("%s",arr2);
	
	return 0;
	
}