Remove unused exception handling and Refactor the function name

src/main/java/budgetbuddy/BudgetBuddy.java

@@ -107,7 +107,7 @@ public void run() {
             } catch (InvalidArgumentSyntaxException e){
                 UserInterface.printInvalidArgumentSyntax(e.getMessage());
             } catch (Exception e) {
-                UserInterface.printUnknownError(e.getMessage());
+                UserInterface.printExceptionErrorMessage(e.getMessage());
             }
         }
 

src/main/java/budgetbuddy/parser/Parser.java

@@ -87,7 +87,7 @@ public Transaction parseUserInputToTransaction(String input, Account account)
     }
 
     //@@author Vavinan
-    public Transaction parseTransactionType(String newTransaction, Account account) throws InvalidEditTransactionData {
+    public Transaction parseEditTransaction(String newTransaction, Account account) throws InvalidEditTransactionData {
         String[] parts = newTransaction.split(" \\| ");
 
         String type = parts[0].trim();

src/main/java/budgetbuddy/transaction/TransactionList.java

@@ -68,9 +68,6 @@ public void removeTransaction(String input, AccountManager accountManager) throw
             throw new EmptyArgumentException("delete index");
         }
         String data = input.substring(DELETE_BEGIN_INDEX).trim();
-        if (isNotInteger(data)) {
-            throw new NumberFormatException(data);
-        }
         int id = Integer.parseInt(data) - INDEX_OFFSET;
         int size = transactions.size();
         if (id >= LOWER_BOUND && id < size) {
@@ -222,7 +219,7 @@ public void processEditTransaction(String input, AccountManager accountManager)
             Transaction transaction = transactions.get(index);
             Account account = accountManager.getAccountByAccountNumber(transaction.getAccountNumber());
             String newTransaction = UserInterface.getEditInformation(transaction.toString());
-            Transaction t = parser.parseTransactionType(newTransaction, account);
+            Transaction t = parser.parseEditTransaction(newTransaction, account);
             transactions.set(index, t);
             UserInterface.printUpdatedTransaction(t);
         } else {

src/main/java/budgetbuddy/ui/UserInterface.java

@@ -72,9 +72,11 @@ public static void printInvalidIndex(String message, int id) {
         System.out.println(LINE);
     }
 
-    public static void printUnknownError(String message) {
+    public static void printExceptionErrorMessage(String message) {
         System.out.println(LINE);
-        System.out.println(TAB_SPACE + "Unknown error occurred with message: " + message);
+        System.out.println(TAB_SPACE + "An error occurred with the message: " + message);
+        System.out.println(TAB_SPACE + "Please check your command Syntax. \n" + TAB_SPACE +
+                " If you need assistance use `help` command to know further about each command syntax.");
         System.out.println(LINE);
     }
 

src/test/java/budgetbuddy/parser/ParserTest.java

@@ -33,7 +33,7 @@ public void testParseTransactionType() throws InvalidEditTransactionData, Invali
 
         // Test case for valid income transaction
         String incomeTransactionString = "income | test1 | 10-11-2022 | 1000.00 | 1";
-        Transaction incomeTransaction = parser.parseTransactionType(incomeTransactionString, account);
+        Transaction incomeTransaction = parser.parseEditTransaction(incomeTransactionString, account);
         assertEquals("test1", incomeTransaction.getDescription());
         assertEquals(1000.00, incomeTransaction.getAmount(), 0.001);
         assertEquals("Dining", incomeTransaction.getCategory().getCategoryName());
@@ -42,7 +42,7 @@ public void testParseTransactionType() throws InvalidEditTransactionData, Invali
 
         // Test case for valid expense transaction
         String expenseTransactionString = "expense | Grocery | 12-11-2022 | 50.00 | 2";
-        Transaction expenseTransaction = parser.parseTransactionType(expenseTransactionString, account);
+        Transaction expenseTransaction = parser.parseEditTransaction(expenseTransactionString, account);
         assertEquals("Grocery", expenseTransaction.getDescription());
         assertEquals(-50.00, expenseTransaction.getAmount(), 0.001);
         assertEquals("Groceries", expenseTransaction.getCategory().getCategoryName());