feat: add Empty method and fix link handling

Added a static `Empty` method to `DownloadEnumerable` for
creating an empty instance. Updated link handling in
`SequentialDownloader` to use `AbsoluteUri` instead of
`ToString()`, ensuring correct link representation.

These changes improve usability and ensure consistency in
link formatting.

Beam/DownloadEnumerable.cs

@@ -10,5 +10,8 @@ namespace Beam {
 
         public IAsyncEnumerator<Ordered<T>> GetAsyncEnumerator(CancellationToken cancellationToken = default) 
             => Download;
+
+        public static DownloadEnumerable<T> Empty()
+            => new(Array.Empty<Ordered<T>>().ToAsyncEnumerable().GetAsyncEnumerator());
     }
 }

Beam/SequentialDownloader.cs

@@ -44,17 +44,17 @@ namespace Beam {
             List<Ordered<string>> links = [];
 
             //Logger?.LogInformation("MoveNextAsync() \n\t -> Links.Current = {} ", LinksEnumerator.Current.Link.AbsoluteUri);
-            links.Add(new Ordered<string>(LinksEnumerator.Current.Link.ToString(), LastOrder++));
+            links.Add(new Ordered<string>(LinksEnumerator.Current.Link.AbsoluteUri, LastOrder++));
 
             while (LinksEnumerator.MoveNext() && LinksEnumerator.Current != SourceLink.InvalidLink && links.Count < idealLinkCount)
-                links.Add(new Ordered<string>(LinksEnumerator.Current.Link.ToString(), LastOrder++));
+                links.Add(new Ordered<string>(LinksEnumerator.Current.Link.AbsoluteUri, LastOrder++));
             //Logger?.LogInformation("MoveNextAsync() \n\t -> links.Count = {} ", links.Count);
             if (links.Count == 0) {
                 Logger?.LogInformation("Out of links!");
                 return false;
             }
 
-            if (links.Any((x) => x.Data == SourceLink.InvalidLink.Link.ToString()))
+            if (links.Any((x) => x.Data == SourceLink.InvalidLink.Link.AbsoluteUri))
                 return false;
 
             var (result, downloadedT) = await unit.TryDownload(

Beam/SourceLinkBuilder.cs

@@ -139,7 +139,7 @@ namespace Beam {
         /// Produces a deep copy whose <see cref="Segments"/> and contained collections are detached from the original.
         /// </summary>
         public SourceLinkBuilder Clone()
-            => new SourceLinkBuilder(Protocol, Host) {
+            => new SourceLinkBuilder(Host, Protocol) {
                 Segments = [.. Segments.Select(static x => x.Clone())]
             };
 

aeqw89.Beam/aeqw89.Beam.csproj

@@ -7,7 +7,7 @@
         <Title>Beam</Title>
         <Authors>aeqw89</Authors>
         <Company>qwsdcvghyu</Company>
-        <Version>1.3.2</Version>
+        <Version>1.3.6</Version>
         <Description>A library for downloading internet resources</Description>
         <PackageProjectUrl>https://github.com/qwsdcvghyu89/Beam</PackageProjectUrl>
         <RepositoryUrl>https://github.com/qwsdcvghyu89/Beam</RepositoryUrl>