changed the file structure

Code/Steiner/findNumberXwithY/src/App.java

@@ -0,0 +1,20 @@
+public class App {
+    public static int findNumber(int numberOfNumbers, String startSequenz) {
+        int counter = 0;
+        int i = Integer.parseInt(startSequenz);
+        while (true) {
+            if (String.valueOf(i).startsWith(startSequenz)) {
+                counter++;
+                if (counter == numberOfNumbers) {
+                    return i;
+                }
+            }
+            i++;
+        }
+    }
+
+    public static void main(String[] args) {
+        System.out.println(findNumber(12, "253"));
+        System.out.println(findNumber(1000, "9876"));
+    }
+}