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