用数组写mycpy函数生成错误，想知道是什么原因

Question

#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>;

char* mycpy(char* dst,const char* src)
{
//数组版本;
    char src[] = {"HELLO"};
    int idx = 0;
    while (src[idx] != '\0')
    {
        dst[idx] = src[idx];
        idx++;

    }
    dst[idx] = '\0';
    return dst;
    printf("%s", dst);
}

//用的是visual stdio编译器，文件名cpp.

Answer 1

把mycpy改为

char *mycpy(char *dst, const char *src) {
  char *p = dst;
  while (*src != '\0')
    *p++ = *src++;
  *p = '\0';
  return dst;
}