char *concat(char *s,...)	{
	va_list args;
	char *buffer;
	buffer = calloc(strlen(s)*1000,sizeof(char));
	va_start(args, s);
	vsprintf(buffer,s, args);
	va_end(args);
	return buffer;
}

char *concat(char *s,...)	{
	va_list args;
	unsigned int l;
	char *buffer;
	l = strlen(s)*1000;
	buffer = calloc(l,sizeof(char));
	va_start(args, s);
	vsprintf(buffer,l,s, args);
	va_end(args);
	return buffer;
}