Метод isSubstringPresent должен возвращать false, если строка substring НЕ является подстрокой строки string. Вроде все так и возвращает?

package com.javarush.task.task27.task2701; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; /* Избавляемся от меток */ public class Solution { public static void main(String[] args) throws IOException { BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); String string = reader.readLine(); String substring = reader.readLine(); if (isSubstringPresent(substring, string)) { System.out.println("String: \n" + substring + "\nis present in the string: \n" + string); } else { System.out.println("String: \n" + substring + "\nis not present in the string: \n" + string); } } static boolean isSubstringPresent(String substring, String string) { boolean found = false; int max = string.length() - substring.length(); if(max < 0 ) return found; boolean[] res = new boolean[max + 1]; for (int i = 0; i <= max; i++) { int length = substring.length(); int j = i; int k = 0; while (length-- != 0) { if (string.charAt(j++) == substring.charAt(k++)) { res[i] = true; } else res[i] = false; } } for(int i = 0; i < res.length; i++) { if(res[i] == true) found = true; } return found; } }