Decipherer.java

public class Decipherer {
     
    public static String  messageSecret(String message) {
        int messagelength = message.length() / 2;
        String substringMessage = message.substring(5, messagelength + 5);
        String replaceMessage = substringMessage.replace ("@#?", " ");
        return new StringBuilder(replaceMessage).reverse().toString();        
    }        
        public static void main(String[] args) {
        System.out.println(messageSecret("0@sn9sirppa@#?ia'jgtvryko1") + " " + messageSecret("q8e?wsellecif@#?sel@#?setuotpazdsy0*b9+mw@x1vj") + " " + messageSecret("aopi?sedohtém@#?sedhtmg+p9l!") + "!"); 
        
    }    
}

➜  Javafive git:(master) ✗ javac Decipherer.java
➜  Javafive git:(master) ✗ java Decipherer      
j'ai appris toutes les ficelles des méthodes!
➜  Javafive git:(master) ✗