add expense_name

internal/validator/expense_validator.go

@@ -28,6 +28,10 @@ func (v *ExpenseValidatorImpl) ValidateCreateExpenseRequest(req *contract.Create
 		return errors.New("request body is required"), constants.MissingFieldErrorCode
 	}
 
+	if strings.TrimSpace(req.ExpenseName) == "" {
+		return errors.New("expense_name is required"), constants.MissingFieldErrorCode
+	}
+
 	if strings.TrimSpace(req.Receiver) == "" {
 		return errors.New("receiver is required"), constants.MissingFieldErrorCode
 	}
@@ -80,6 +84,10 @@ func (v *ExpenseValidatorImpl) ValidateUpdateExpenseRequest(req *contract.Update
 		return errors.New("request body is required"), constants.MissingFieldErrorCode
 	}
 
+	if req.ExpenseName != nil && strings.TrimSpace(*req.ExpenseName) == "" {
+		return errors.New("expense_name cannot be empty"), constants.MalformedFieldErrorCode
+	}
+
 	if req.Receiver != nil && strings.TrimSpace(*req.Receiver) == "" {
 		return errors.New("receiver cannot be empty"), constants.MalformedFieldErrorCode
 	}