text: #ifndef _MAIN_
  #define _MAIN_
  
  #include <sstream>
  #include <iostream>
  #include <string>
  #include <cstdarg>
  
  /*const char* str(const char *fmt, ...){
      std::stringstream builder;
      va_list args;
      va_start(args, fmt);
  
      while (*fmt != '\0') {
          if (*fmt == 'd') {
              int i = va_arg(args, int);
              builder << std::to_string(i);
          } else if (*fmt == 's') {
              char * s = va_arg(args, char*);
              builder << s;
          }
          ++fmt;
      }
  
      va_end(args);
      return builder.str().c_str();
  }*/
  
  #endif