title: Const char * vs const wchar_t* (concatenation)
body: <p>which is the best way to concat?</p>
  
  <pre><code>const char * s1= "\nInit() failed: ";
  const char * s2 = "\n";
  char buf[100];
  strcpy(buf, s1);
  strcat(buf, initError);
  strcat(buf, s2);
  wprintf(buf);
  </code></pre>
  
  <p>It gives error. What should be the correct way?</p>
  
  <p>Thanks.</p>