You are given a file that contains different words as well as punctuation.
You need to filter out only the words starting with w, and remove any punctuation if necessary.
The result should be returned as a naturally sorted array. All words should be lower-case.
If the file does not contain the necessary words, return an empty array.
Examples:
"Width world Wide web"
Result: ["web", "wide", "width", "world"]
"WWW? Four-bedroom farmhouse in the countryside. Wave! All of the four double bedrooms are en suite."
Result: ["wave", "www"]
Hint: try to split Strings with a regular expression that includes whitespace and punctuation characters. Here is a good article.