The final task is to make the following modifications:

$$ The symbol table should be initialized before each statement is evaluated, so that

variables that are reused do not contain the value from a previous statement

$$ Statements containing uninitialized variables should be reported as an error

$$ A variable initialized more than once in a statement should be reported as an error

$($Creating an exception class to accommodate this error and the previous one is the

recommended approach$)$