$-$ Con$3\mathrm{.}3$ Required methods: ContactBook class

$$ Default Constructor

$$ Find $-$ Takes in a string that can either be a phone number or a name and returns the found contact

as a pointer. Returns a nullptr if a given string is not a name or a number in the contact system.

$$ Add $-$ Takes in a contact object and stores its memory address in the furthest$-$most empty position

in the array. The current order of contacts in the array must be preserved. $($Note: passing by value

will result in a garbage pointer$).$ It returns nothing. Also know that there will never be a

test case that tries to add a Contact that already exists in the ContactBook, and this

applies for all the addition functions, even the operators.

$$ AddContacts $-$ Takes in a vector of contact pointers, and stores all of it$$s values in the class$$s array,

in the same order that they were in the vector. It returns nothing.

$$ Remove $-$ Takes in a contact object, and removes the associated contact from the array. $($See the

note in Add$)$ The rest of the contacts should stay in the same order in the array, which may mean

you would have to shift all the pointers ahead in the array back one place. It returns nothing.

$$ Display $-$ Displays each contact in the contact book, in the order that they are stored in the array.

For example like this:

Roland, $456-789-0123$

Andres, $987-654-3210$

George, $234-567-8901$

Lily, $345-678-9012$

Justin, $123-456-7890$

$$ Alphabetize $-$ sorts the array in alphabetical order based on contact name. Note that in this special

case, Albert would come before Alberta. This should be the only function that can alter the order

that the contacts are stored in the array.

$$ the following operators:

$+=$ Contact $-$ Adds a single contact to a ContactBook object

$+=$ ContactBook $-$ Adds all contacts from the passed in ContactBook to this object. Adding

them to the back in the order they are in the other ContactBook$$s array.

$+$ ContactBook $-$ Adds two contact books together and returns the resulting ContactBook.

$-=$ Contact $-$ Removes the Contact that matches the passed$-$in Contact.

$-=$ ContactBook $-$ Removes all contacts from a passed in ContactBook from this objecttactBook $-$ Same as above, but returns a new ContactBook object as the result instead

of modifying the current one

$==$ ContactBook $-$ Equality operator, if two ContactBooks have all the same Contacts in

them, in any order. Meaning that contacts may not exactly be in the same order in both

arrays in each of the ContactBooks.

$!=$ ContactBook $-$ Same as above, but the not equal operator