1. [AsciiString]
(http://netty.io/4.1/api/io/netty/util/AsciiString.html)
2. [CharBuffer]
(https://docs.oracle.com/javase/8/docs/api/java/nio/CharBuffer.html)
3. [StringBuilder]
(https://docs.oracle.com/javase/8/docs/api/java/lang/StringBuilder.html)