❔ I need help with Binary search alphabetically

Guys, I have this assignment where they want me to implement this Binary search algo
Console.WriteLine("\n\tWhich letter should the search start with?");
                                 string key = Console.ReadLine(); ; // Receives the user's search
                                 if (key.Length <= 0) key = "a"; // Makes sure the search is always something, in this case "a"
                                 /*
                                  * BINARY SEARCH using letters
                                  *
                                  * Based on the new tools we've gone through before (CompareTo and extracting single chars from strings for comparisons) so
                                  * here we should write a binary search to look for letters.
                                  *
                                  */
                                 LetterPrint(wordList); // Print the entire list using our method.
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