Remove HtmlHelper.UnescapeNullable

Author: Akarinnnnn

src/Markdig/Helpers/HtmlHelper.cs

@@ -465,24 +465,6 @@ private static bool TryParseHtmlTagProcessingInstruction(ref StringSlice text, r
         }
     }
 
-    /// <summary>
-    /// Destructively unescape a string: remove backslashes before punctuation or symbol characters.
-    /// </summary>
-    /// <param name="text">The string data that will be changed by unescaping any punctuation or symbol characters.</param>
-    /// <param name="removeBackSlash">if set to <c>true</c> [remove back slash].</param>
-    /// <returns>Unescaped text, or null if <paramref name="text"/> is null.<returns>
-    public static string? UnescapeNullable(string? text, bool removeBackSlash = true)
-    {
-        if (text == null)
-        {
-            return null;
-        }
-        else
-        {
-            return Unescape(text, removeBackSlash);
-        }
-    }
-
     /// <summary>
     /// Destructively unescape a string: remove backslashes before punctuation or symbol characters.
     /// </summary>

src/Markdig/Parsers/Inlines/LinkInlineParser.cs

@@ -260,7 +260,7 @@ private bool TryProcessLinkOrImage(InlineProcessor inlineState, ref StringSlice
                     link = new LinkInline()
                     {
                         Url = HtmlHelper.Unescape(url, removeBackSlash: false),
-                        Title = HtmlHelper.UnescapeNullable(title, removeBackSlash: false),
+                        Title = title is null ? null : HtmlHelper.Unescape(title, removeBackSlash: false),
                         IsImage = openParent.IsImage,
                         LabelSpan = openParent.LabelSpan,
                         UrlSpan = inlineState.GetSourcePositionFromLocalSpan(linkSpan),