Почему такое решение не принимает валидатор?

package com.javarush.task.task18.task1808; import java.io.*; /* Разделение файла */ public class Solution { public static void main(String[] args) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String fileName = "/Users/artemtimonin/IdeaProjects/JavaRushTasks/"+reader.readLine(); String fileName2 = "/Users/artemtimonin/IdeaProjects/JavaRushTasks/"+reader.readLine(); String fileName3 = "/Users/artemtimonin/IdeaProjects/JavaRushTasks/"+reader.readLine(); int bit; try (FileInputStream fileInputStream = new FileInputStream(fileName); FileOutputStream file2 = new FileOutputStream(fileName2); FileOutputStream file3 = new FileOutputStream(fileName3)){ int half = fileInputStream.available()/2; if(fileInputStream.available()%2==0) { while (fileInputStream.available()>0){ if (fileInputStream.available()>half){ bit = fileInputStream.read(); file2.write(bit); } else { bit = fileInputStream.read(); file3.write(bit); } } } else { while (fileInputStream.available()>0) { int withRemains = half - fileInputStream.available()%2; if (fileInputStream.available()>withRemains){ bit = fileInputStream.read(); file2.write(bit); } else { bit = fileInputStream.read(); file3.write(bit); } } } } } }