feat(SessionManager): Method to remove current save.

src/main/java/edu/ntnu/idi/idatt/storage/SessionManager.java

@@ -128,6 +128,36 @@ public static boolean loadSession(String playerName) {
     return false;
   }
 
+  /**
+   * Method to remove current session
+   */
+  public static void removeSession() {
+    // don't save if current session is null accidentally
+    if (UserSession.getInstance().getPlayer() == null || UserSession.getInstance().getExchange() == null) {
+      return;
+    }
+
+    // Load all sessions
+    List<SessionBundle> bundles = loadAllSessions();
+
+    try (Writer writer = new FileWriter(StorageFile.getStorageFile().toFile())) {
+
+      // Append current session
+      SessionBundle existing = bundles.stream()
+          .filter(s -> s.getPlayer().getName().equals(UserSession.getInstance().getPlayer().getName()))
+          .findFirst().orElse(null);
+
+      if (existing != null) {
+        bundles.remove(bundles.indexOf(existing));
+      }
+
+      gson.toJson(bundles, writer);
+
+    } catch (IOException e) {
+      throw new RuntimeException("Failed to remove current session!", e);
+    }
+  }
+
   /**
    * Method for serialization of all sessions.
    *