Add a multiplication method $(\_\_$mul$\_\_)$ to the Fraction class so that it will be able to use the $*$ operator to multiply two Fractions. This method should return a simplified Fraction the is the product of the two fractions.

The Fraction class has already been supplied $-$ based on the one that was in the reading. You just need to add the new $\_\_$mul$\_\_$ method and test it out.

Hint: See the $\_\_$add$\_\_$ method as an example.