changed the file structure

Code/Steiner/theMostBasicHash/src/App.java

@@ -0,0 +1,58 @@
+import java.util.Scanner;
+
+public class App {
+    public static void main(String[] args) {
+        Scanner scanner = new Scanner(System.in);
+
+        System.out.println("Enter a message to encrypt:");
+        String originalMessage = scanner.nextLine();
+
+        // Encrypt the message
+        System.out.println("Enter the encryption key (an integer):");
+        int encryptionKey = scanner.nextInt();
+        String encryptedMessage = encrypt(originalMessage, encryptionKey);
+        System.out.println("Encrypted message: " + encryptedMessage);
+
+        // Decrypt the message
+        String decryptedMessage = decrypt(encryptedMessage, encryptionKey);
+        System.out.println("Decrypted message: " + decryptedMessage);
+
+        scanner.close();
+    }
+
+    // Method to encrypt a message using Caesar cipher
+    private static String encrypt(String message, int key) {
+        StringBuilder encryptedText = new StringBuilder();
+
+        for (int i = 0; i < message.length(); i++) {
+            char currentChar = message.charAt(i);
+
+            if (Character.isLetter(currentChar)) {
+                char encryptedChar = (char) ((currentChar - 'A' + key) % 26 + 'A');
+                encryptedText.append(encryptedChar);
+            } else {
+                encryptedText.append(currentChar);
+            }
+        }
+
+        return encryptedText.toString();
+    }
+
+    // Method to decrypt an encrypted message using Caesar cipher
+    private static String decrypt(String encryptedMessage, int key) {
+        StringBuilder decryptedText = new StringBuilder();
+
+        for (int i = 0; i < encryptedMessage.length(); i++) {
+            char currentChar = encryptedMessage.charAt(i);
+
+            if (Character.isLetter(currentChar)) {
+                char decryptedChar = (char) ((currentChar - 'A' - key + 26) % 26 + 'A');
+                decryptedText.append(decryptedChar);
+            } else {
+                decryptedText.append(currentChar);
+            }
+        }
+
+        return decryptedText.toString();
+    }
+}