Segfault when concatenating 2 wchar_t*

Question

#include <iostream>
#include <stdio.h>
#include <wchar.h>
using namespace std;

int main()
{
 wchar_t* val = L"do";
 wchar_t* param = L"it";
 wcscat(val, param);
 std::wcout << val;
}

I'm getting a segmentation fault. I need to concatenate these 2:

wchar_t* val = L"Do";
wchar_t* param= L"it";