changed the file structure

Code/Steiner/bookAufgabe3/.vscode/settings.json

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+{
+    "java.project.sourcePaths": ["src"],
+    "java.project.outputPath": "bin",
+    "java.project.referencedLibraries": [
+        "lib/**/*.jar"
+    ]
+}

Code/Steiner/bookAufgabe3/README.md

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+## Getting Started
+
+Welcome to the VS Code Java world. Here is a guideline to help you get started to write Java code in Visual Studio Code.
+
+## Folder Structure
+
+The workspace contains two folders by default, where:
+
+- `src`: the folder to maintain sources
+- `lib`: the folder to maintain dependencies
+
+Meanwhile, the compiled output files will be generated in the `bin` folder by default.
+
+> If you want to customize the folder structure, open `.vscode/settings.json` and update the related settings there.
+
+## Dependency Management
+
+The `JAVA PROJECTS` view allows you to manage your dependencies. More details can be found [here](https://github.com/microsoft/vscode-java-dependency#manage-dependencies).

Code/Steiner/bookAufgabe3/src/App.java

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+
+// împort java extansions
+import java.util.Scanner;
+
+public class App {
+    public static void main(String[] args) {
+        Scanner scan = new Scanner(System.in);
+
+        System.out.println("Give me a number please:");
+        int number = scan.nextInt();
+        int math = 0;
+        int numberOfDigits = 0;
+        int sum = 0;
+
+        // Number of digits
+        for (int tempNumber = number; tempNumber > 0; tempNumber = tempNumber / 10) {
+            numberOfDigits++;
+        }
+
+        // math the digits-diffrence
+        for (int tempNumber = number; tempNumber > 0; tempNumber = tempNumber / 10) {
+            math = tempNumber % 10;
+            sum += math;
+        }
+
+        System.out.println("Anzahl der Ziffern: " + numberOfDigits);
+        System.out.println("Ziffernsumme: " + sum);
+
+        scan.close();
+    }
+}