Правилни реченици

import java.util.Scanner;

public class Recenica {
    public static SLL<Character> popravka(SLL<Character> lista){
        SLLNode<Character> tmp=lista.getFirst();
        SLLNode<Character> prvaB=tmp;
        int flag=0;
        while(tmp!=null) {
            if(tmp.element=='.')
                break;
            if(tmp.element==' '){
                tmp=tmp.succ;
                continue;
            }
            prvaB = tmp;
            while (tmp.succ.element != ' ' && tmp.succ.element!='.') {
                tmp = tmp.succ;
            }

            lista.insertBefore(tmp.element, prvaB);
            SLLNode<Character> kopija = tmp;
            lista.delete(tmp);
            tmp = kopija.succ;
        }
        return lista;
    }
    public static void main(String[] args) {
        Scanner in=new Scanner(System.in);

        String recenica=in.nextLine();
        System.out.println(recenica);
        SLL<Character> lista=new SLL<Character>();

        for(int i=0;i<recenica.length();i++){
            lista.insertLast(recenica.charAt(i));
        }

        System.out.println(popravka(lista));
    }
}