Exclude Similarities in List of Strings to extract the Difference

Question

I have a list of sentences that are the same except for the Title of the book.

How can I loop through the list and exclude the similarities to find the title of the book

Answer 1

A working solution using LINQ:

List sentences = new List() { };
List titles = new List() { };

sentences.Add("The book named Lord of the Flies is a classic.");
sentences.Add("The book named To Kill a Mockingbird is a classic.");
sentences.Add("The book named The Catcher in the Rye is a classic.");
sentences.Add("Hello");
sentences.Add("The book named ");


titles = sentences.Where(sentence => sentence.Length > "The book named ".Length + " is a classic".Length)
            .GroupBy(sentence => sentence.Substring(0, 15), sentence => sentence.Remove(sentence.Length - " is a classic".Length).Substring("The book named ".Length))
            .Where(g => g.Key == "The book named ")
            .SelectMany(g => g)
            .ToList();

foreach (var title in titles)
    WriteLine(title);

First, it filters out sentences too short to meet the criteria, then groups the results by first 15 letters and extracts the titles with String.Remove.