Not allowed to add a customer whose name exactly matches one already present in the address book

[saiutkarsh33]

Actual behaviour:

Not allowed to add a customer whose name exactly matches one already present in the address book

The following error shows:

This person already exists in the address book

Expected behaviour:

Different people might have the same name. since deletion and edits are done via customer id itself, being able to add a contact with the same name will not affect other commands and will just add functionality to this application