char *ltrim(char *str, const char *seps)	{
	size_t totrim;
	if (seps == NULL) {
		seps = "\t\n\v\f\r ";
	}
	totrim = strspn(str, seps);
	if (totrim > 0) {
		size_t len = strlen(str);
		if (totrim == len) {
			str[0] = '\0';
		}
		else {
			memmove(str, str + totrim, len + 1 - totrim);
		}
	}
	return str;
}
 
char *rtrim(char *str, const char *seps)	{
	int i;
	if (seps == NULL) {
		seps = "\t\n\v\f\r ";
	}
	i = strlen(str) - 1;
	while (i >= 0 && strchr(seps, str[i]) != NULL) {
		str[i] = '\0';
		i--;
	}
	return str;
}
 
char *trim(char *str, const char *seps)	{
	return ltrim(rtrim(str, seps), seps);
}