Was ist falsch? Auch der Hinweiß vom Admin wird erfüllt :-(

package de.codegym.task.task08.task0823;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
//import java.util.Arrays;

/*
Landesweite Restaurantkette
*/

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String s = reader.readLine();

        //schreib hier deinen Code
        StringBuilder s1 = new StringBuilder();
        String stemp;
        String[] parts = s.split("[,!? +&$§=\"\\[\\\\|\\]/'<>0-9()^;*%:³²€@`´}{~_#\\-]");
        //System.out.println(parts.length + " " + Arrays.toString(parts));
        for (String part : parts) {
            if (!part.equals("") && !part.equals(".")) s1.append(part.substring(0, 1).toUpperCase()).append(part.substring(1)).append(" ");
            if (part.equals(".")) {
                stemp = s1.toString().trim();
                s1 = new StringBuilder(stemp + part.substring(0, 1).toUpperCase() + part.substring(1));
            }
        }
        System.out.println( s1 );
    }
}