remove the Option to simplify code

Author: FreeApophis

Messerli.ChangeCase/StringCaseExtensions.Private.cs

@@ -105,7 +105,7 @@ private static string JoinStrings(this IEnumerable<string> strings, string separ
 
         private static IEnumerable<string> SplitBy(this string text, ExtractElement extractNext)
             => Sequence
-                .Generate(new SplitResult(0), previous => extractNext(text, previous.NextStartIndex))
+                .Generate(new SplitResult(0, string.Empty), previous => extractNext(text, previous.NextStartIndex))
                 .Select(r => r.Result);
 
         private static int GetIndex(ValueWithIndex<char> value)

Messerli.ChangeCase/StringCaseExtensions.SplitResult.cs

@@ -10,14 +10,8 @@ private readonly struct SplitResult
 
             public readonly int NextStartIndex;
 
-            public SplitResult(int nextStartIndex, Option<string> result = default)
-                => (Result, NextStartIndex) = (FlattenResult(result), nextStartIndex);
-
-            private static string FlattenResult(Option<string> result)
-                => result
-                    .Match(
-                        none: string.Empty,
-                        some: ToLower);
+            public SplitResult(int nextStartIndex, string result)
+                => (Result, NextStartIndex) = (result.ToLower(), nextStartIndex);
         }
     }
 }