zx returns right string result(without newline)

Author: neuecc

sandbox/ConsoleApp/Program.cs

@@ -8,7 +8,7 @@
 using Zx;
 using static Zx.Env;
 
-
+var version = await "dotnet --version";
 
 
 // `await string` execute process like shell

src/ProcessX/ProcessAsyncEnumerable.cs

@@ -41,7 +41,10 @@ public async Task<string> FirstAsync(CancellationToken cancellationToken = defau
             string? data = null;
             await foreach (var item in this.WithCancellation(cancellationToken).ConfigureAwait(false))
             {
-                data = (item ?? "");
+                if (data == null)
+                {
+                    data = (item ?? "");
+                }
             }
 
             if (data == null)
@@ -62,7 +65,10 @@ public async Task<string> FirstAsync(CancellationToken cancellationToken = defau
             string? data = null;
             await foreach (var item in this.WithCancellation(cancellationToken).ConfigureAwait(false))
             {
-                data = (item ?? "");
+                if (data == null)
+                {
+                    data = (item ?? "");
+                }
             }
             return data;
         }

src/ProcessX/Zx/Env.cs

@@ -198,9 +198,19 @@ public static IDisposable color(ConsoleColor color)
 
             var runStdout = Task.Run(async () =>
             {
+                var isFirst = true;
                 await foreach (var item in stdout.WithCancellation(cancellationToken).ConfigureAwait(false))
                 {
-                    sbOut.AppendLine(item);
+                    if (!isFirst)
+                    {
+                        sbOut.AppendLine();
+                    }
+                    else
+                    {
+                        isFirst = false;
+                    }
+
+                    sbOut.Append(item);
 
                     if (verbose && !forceSilcent)
                     {
@@ -211,9 +221,18 @@ public static IDisposable color(ConsoleColor color)
 
             var runStdError = Task.Run(async () =>
             {
+                var isFirst = true;
                 await foreach (var item in stderror.WithCancellation(cancellationToken).ConfigureAwait(false))
                 {
-                    sbError.AppendLine(item);
+                    if (!isFirst)
+                    {
+                        sbOut.AppendLine();
+                    }
+                    else
+                    {
+                        isFirst = false;
+                    }
+                    sbError.Append(item);
 
                     if (verbose && !forceSilcent)
                     {