frustration=nstrcat(des,...);(ver 1.1)

#include <iostream>
#include <stdarg.h>

const char* nstrcat(char* des,...);
void merge(char*, char*);

const char* nstrcat(char* des,...){
      va_list pass;
      va_start(pass,des);
      char* base;
      while(base=va_arg(pass,char*)){
          if(base)merge(des,base);
          else break;
      }
      va_end(pass);
      return des;
}
void merge(char* des,char* base){
     int i=0,j=0;
     for(i;des[i];i++);
     for(i;base[j];i++,j++){
         des[i]=base[j];
     }  
}
The hardest thing to wrap your head around when you first start working with va_list's (it seems to me) is the idea that each time you reference the list with va_arg it advances the the address pointer for the parameter list.  Once you figure out how to work with that the rest goes pretty easy.