Function canonicalize

tools/check-bolt.c:20–41

Turn any whitespace into a single space. */

/* Turn any whitespace into a single space. */
static char *canonicalize(char *str)
{
	char *to = str, *from = str;
	bool have_space = true;

	while (*from) {
		if (cisspace(*from)) {
			if (!have_space)
				*(to++) = ' ';
			have_space = true;
		} else {
			*(to++) = *from;
			have_space = false;
		}
		from++;
	}
	if (have_space && to != str)
		to--;
	*to = '\0';
	tal_resize(&str, to + 1 - str);
	return str;
}

static bool get_files(const char *dir, const char *subdir,
		      struct bolt_file **files)