Input: add amt/100 t/01-02-2023 cat/food cur/not a currency
Expected Output: Invalid Input (or something with Invalid Currency to prompt user)
Actual Output: The following expense is successfully added: SGD100.00 cat:food date:01/02/2023
Reason: Could perhaps have a new error to prompt user when he/she typing incorrect currency format
Input: add amt/100 t/01-02-2023 cat/food cur/not a currency
Expected Output: Invalid Input (or something with Invalid Currency to prompt user)
Actual Output: The following expense is successfully added: SGD100.00 cat:food date:01/02/2023
Reason: Could perhaps have a new error to prompt user when he/she typing incorrect currency format