Inventory

package Demo;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

public class Inventory {
    public static void main(String[] args) throws IOException {
        BufferedReader scanner = new BufferedReader(new InputStreamReader(System.in));


        List<String> items = new ArrayList<>(List.of(scanner.readLine().split(", ")));
        String command;
        while (!"Craft!".equals(command = scanner.readLine())) {
            String[] tokens = command.split("\\s-\\s");

            if (tokens[0].equals("Collect")) {
                if (!items.contains(tokens[1])) {
                    items.add(tokens[1]);
                }

            } else if (tokens[0].equals("Drop")) {
                items.remove(tokens[1]);

            } else if (tokens[0].equals("Combine Items")) {
                String[] oldAndNew = tokens[1].split(":");
                if (items.contains(oldAndNew[0])) {
                    int index = items.indexOf(oldAndNew[0]) + 1;
                    items.add(index, oldAndNew[1]);
                }

            } else if (tokens[0].equals("Renew")) {
                if (items.contains(tokens[1])) {
                    items.remove(tokens[1]);
                    items.add(tokens[1]);
                }
            }
        }
        System.out.println(String.join(", ", items));
    }
}