title: single char strcat -C
body: <p>I want to put two single <code>char</code> together.
  Should I use the function strcat?</p>
  
  <p>the following is my code</p>
  
  <pre><code>int main(){
      char *a[4]={"1","2","3","4"};
      char *new_a[2];    
     for (i=0;i&lt;2;i++){
      new_a[i]=strcat(a[2*i],a[2*i+1]);
      printf("%c",*new_a[i]);
     }
      return 0;
  }
  </code></pre>
  
  <p>I want to print new_a[0] to be 12, and new_a[1] to be 34</p>