Simplify UsbDeviceManager.containsFunction()

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Arrays;

import java.util.HashMap;

import java.util.LinkedList;

import java.util.List;

    }

    private static boolean containsFunction(String functions, String function) {

        int index = functions.indexOf(function);

        if (index < 0) return false;

        if (index > 0 && functions.charAt(index - 1) != ',') return false;

        int charAfter = index + function.length();

        if (charAfter < functions.length() && functions.charAt(charAfter) != ',') return false;

        return true;

        return Arrays.asList(functions.split(",")).contains(function);

    }

    private final class UsbHandler extends Handler {