void append(final char c) {
			if (index == buffer.length) {
				increaseSize(buffer.length*2);
			}

			buffer[index++] = c;
		}
Allows appending chars in bulks to {@link StringBuilder}.

@since 8.2
@version 8.2
jenetics.ext/src/main/java/io/jenetics/ext/util/CsvSupport.java