Method compare

src/string.cpp:269–277

	static bool lt(char c1, char c2) { return toupper(c1) <  toupper(c2); }

	static int compare(const char *s1, const char *s2, size_t n)
	{
		while (n-- != 0) {
			if (toupper(*s1) < toupper(*s2)) return -1;
			if (toupper(*s1) > toupper(*s2)) return 1;
			++s1; ++s2;
		}
		return 0;
	}

	static const char *find(const char *s, size_t n, char a)
	{