Added method for clearing SelectedBudget.current file

src/main/java/no/ntnu/idatt1002/demo/data/Budget/FileHandlingSelectedBudget.java

@@ -22,7 +22,7 @@ public class FileHandlingSelectedBudget {
         selectedBudgetFileType))) {
       return br.readLine();
     } catch (IOException ioException) {
-      throw new IOException("File: CurrentFile.txt does not exist", ioException);
+      throw new IOException("File: SelectedBudget.current does not exist", ioException);
     }
   }
 
@@ -36,6 +36,16 @@ public class FileHandlingSelectedBudget {
     }
   }
 
+  public static void clearSelectedBudget() throws IOException {
+    try (BufferedWriter bw = new BufferedWriter(new FileWriter(filePath + "SelectedBudget" +
+        selectedBudgetFileType))) {
+      bw.write("");
+      System.out.println("Current file is: ");
+    } catch (IOException ex) {
+      throw new IOException("Error writing to file: " + "SelectedBudget.current");
+    }
+  }
+
   public static boolean isSelectedBudgetEmpty(String fileTitle) throws IOException {
     try (BufferedReader br = new BufferedReader(new FileReader(filePath
         + "SelectedBudget" + selectedBudgetFileType))) {