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A phone service provider company wants to calculate the total bills for each customer; that is, one customer can have more than one phone numbers and therefore bills (you do not know how many phone numbers he/she may has. For each customer, unique ID is generated automatically, and once established it can’t be modified

2. Use non class member function which takes object/s as argument to compare the number of contacts between two customers and return ID of customer with more numbers [note that this function can access private data members of the class directly]