Write the AddressList method newBusiness. This method searches addresses for an

existing business with an identical address (i. e. an address object for which street matches

st and number matches no). If this is found, then the method updates the item in the list to

an address with name nm, street st and number no. If no entry with a matching street and

number exists, then the method adds a new address to the end of the list with name nm,

street st and number no. The method should return the index on Addresses where the

address has been updated or added.

(Sample code in pdf)