import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.List;

import com.opencsv.CSVReader;
import com.opencsv.CSVWriter;

public class RemoveEmptyRows {

    public static void main(String[] args) {
        String inputFilePath = "input.csv";
        String outputFilePath = "output.csv";

        try (CSVReader reader = new CSVReader(new FileReader(inputFilePath)); 
                CSVWriter writer = new CSVWriter(new FileWriter(outputFilePath))) {

            List<String[]> lines = reader.readAll();

            // Remove empty rows
            lines.removeIf(line -> line.length == 0 || (line.length == 1 && line[0].isEmpty()));

            // Write the updated lines to the output file
            writer.writeAll(lines);

            System.out.println("Empty rows removed successfully!");

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}