I agree: not to discourage OP, but there is plenty of XMPP implementations (as well as those for other protocols), yet very few complete (say, in the XEP-0387 sense) ones, and even fewer reusable (libraries providing C interface, or something else more or less common and standard) ones. It seems that it would be more useful to put time/effort into improving those, unless there are really good reasons for making new ones.