int readnumber(char* string, int* ppos)
{
   int result = 0;
    
   while(*ptr >= '0' && *ptr <= '9')
   {
       result *= 10;
       result += *ptr;
       ptr++;
       *ppos++;
   }
   
   return result;
}

int calcstring(char* string, int* ppos)
{
   char* ptr = string;
   int result = 0;
   int idx = 0;

   while(*ptr)
   {
      int pos = 0;
      if(*ptr == '(')
      {
         result = calcstring(ptr++, &pos);
         ptr += pos;
         idx += pos;
      }
      else if(*ptr == ')')
      {
         if(ppos) *ppos = idx;
         return result;
      }
      else if(*ptr >= '1' && *ptr <= '9')
      {
         int num = readnumber(ptr, &pos);
         printf("num gelesen: %i\n", num);
         ptr += pos-1;
         idx += pos-1;
      }
      
      idx++; ptr++;
   }
   
   return result;
}