How to solve the Exception Thrown Errors in C code?

I've written this code in Visual Studio Community 2019 to copy string. It had no error when debug but came with error in stdio.h when compile, Here is the error:

Exception Thrown

Exception thrown at 0x00007FF890DEF455(ucrtbased.dll) in StringCopy.exe:0xC0000005:Access violation writing location 0x000000C45C100000

And here are the codes:

#include<stdio.h>
#include<conio.h>
int main()
{
  int i;
  char s1[128],s2[128];
  printf_s("Enter string:\n");
  scanf_s("%s",s1);
  for(i=0;s1[i]!='\0';i++)
    {
      s2[i] = s1[i];
    }
  s2[i] = '\0';
  printf_s("The output string is : %s",s2);
  return 0;
  _getch();
}

If anyone can show me a full solution to this problem I'll be very grateful! Thank you!