模擬實現strcpy

char *my_strcpy(char *dest, const char *str)  
{  
    char *ret=dest;  
    while(*dest++ = *str++)
    {
        ;
    }
        return ret;  
}  
int main()  
{  
    char arr1[64] = "hello";  
    char arr2[]="world";  
    my_strcpy(arr1, arr2);  
    printf("%s\n",arr1);  
    return 0;  
}