Write a method greet(name) that interpolates name in a simple greeting.

Example: when name is "Bob", the method should return the string "Hello, Bob.".

Handle nulls by introducing a stand-in.

Example: when name is null, then the method should return the string "Hello, my friend."

Handle uppercase names by returning an uppercase greeting.

Example: when name is "JERRY" then the method should return the string "HELLO JERRY!"

Handle an array of two names.

Example: when name is ["Jill", "Jane"], then the method should return the string "Hello, Jill and Jane."

Handle arrays of 3 or more names.

Example: when name is ["Amy", "Brian", "Charlotte"], then the method should return the string "Hello, Amy, Brian, and Charlotte."

Handle arrays of mixed case names.

Example: when name is ["Amy", "BRIAN", "Charlotte"], then the method should return the string "Hello, Amy and Charlotte. AND HELLO BRIAN!"

Handle arrays of names where a single item in the array contains two names.

Example: when name is ["Bob", "Charlie, Dianne"], then the method should return the string "Hello, Bob, Charlie, and Dianne.".

Handle deliberate commas indicated by escaped double quotation marks.

Example: when name is ["Bob", ""Charlie, Dianne""], then the method should return the string "Hello, Bob and Charlie, Dianne.".