Problem Statement:

A customer support system stores user messages in a database. Before saving, the messages need to be sanitised to remove extra spaces, ensure consistent formatting, and replace prohibited words. Your task is to implement a message sanitiser that prepares these messages for storage.

Task:

Write a function that takes a message string and a list of prohibited words. The function should:

• Remove leading, trailing, and multiple consecutive spaces.
• Capitalize the first character of each sentence.
• Replace prohibited words with "****" (case insensitive).

Input:

• A string message (length ≤ 1000 characters).
• An array of prohibited words prohibitedWords[] (case insensitive, length ≤ 100).

Output:

A sanitised version of the message that follows the above rules.

Examples:

Example 1:

message = "  hello    world!   this is    a sample   message.  badword1   should not appear. "
prohibitedWords = ["badword1", "badword2"]
        

Output:

"Hello world! This is a sample message. **** should not appear."
        

Example 2:

message = "THIS   is a    test message.   it contains BADword2 and should be clean."
prohibitedWords = ["badword2"]
        

Output:

"This is a test message. It contains **** and should be clean."
        

Example 3:

message = "no bad words here.   just     extra   spaces."
prohibitedWords = []
        

Output:

"No bad words here. Just extra spaces."
        

Example 4:

message = "  why is  THIS happening?   fix    the problem!"
prohibitedWords = []
        

Output:

"Why is this happening? Fix the problem!"
        

Constraints:

• 1 ≤ |message| ≤ 1000
• 0 ≤ |prohibitedWords| ≤ 100

Handle punctuation correctly. Sentences are separated by ., !, or ?. Preserve punctuation. Match prohibited words case-insensitively and replace them entirely with "****".