Changing design pattern

src/main/java/edu/ntnu/idi/idatt/Controller/exchangePageController.java

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+package edu.ntnu.idi.idatt.Controller;
+
+public class exchangePageController {
+}

src/main/java/edu/ntnu/idi/idatt/Controller/mainPageController.java

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+package edu.ntnu.idi.idatt.Controller;
+
+public class mainPageController {
+}

src/main/java/edu/ntnu/idi/idatt/Observer.java

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+package edu.ntnu.idi.idatt;
+
+public interface Observer {
+
+    void update();
+}

src/main/java/edu/ntnu/idi/idatt/View/exchangePage.java

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+package edu.ntnu.idi.idatt.View;
+
+public class exchangePage {
+}

src/main/java/edu/ntnu/idi/idatt/View/mainPage.java

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+package edu.ntnu.idi.idatt.View;
+
+public class mainPage {
+}