changed the file structure

Code/Steiner/reverseNumber/src/App.java

@@ -0,0 +1,18 @@
+public class App {
+    public static int reverse(int number) {
+        int reversed = 0;
+        while (number != 0) {
+            int remainder = number % 10;
+            reversed = reversed * 10 + remainder;
+            number = number / 10;
+        }
+        return reversed;
+    }
+
+    public static void main(String[] args) {
+        int number = 12345;
+        int reversed = reverse(number);
+        System.out.println("The number is: " + number);
+        System.out.println("The reversed number is: " + reversed);
+    }
+}