Delete unnecessary code from a java files.

The code of the app that i have needs only a few functions of library GNU Pircbot. I want isolate only the part of the code that I need from library GNU Pirbot and delete the rest the code and archives. I have only three files of my app that use some Pircbot code. You are an expert in java, I propose you: 1º)Mark in these 3 files for example with red letter the parts of the code that depends of PircBot. 2º)Only four pircbot files are used. You must delete ALL the part of the code of this files that is not necessary for my app and delete the rest of Pircbot files unnecessaries. The objetive of all this for me is to obtain only the strictly necessary Pircbot code. Then i will try to change this code to swift iOS and analyze the necessary libraries. But you only have to do the part of isolating the Pircbot code that is necessary and delete the rest.