Method trim

Sming/Wiring/WString.cpp:905–925

}

void String::trim(const char* set)
{
	auto len = length();
	if(len == 0) {
		return;
	}
	auto buf = buffer();
	char* begin = buf;
	while(strchr(set, *begin)) {
		begin++;
	}
	char* end = buf + len - 1;
	while(strchr(set, *end) && end >= begin) {
		end--;
	}
	len = end + 1 - begin;
	if(begin > buf) {
		memmove(buf, begin, len);
	}
	setlen(len);
}

String& String::pad(int16_t minWidth, char c)
{