Clean up

DiscordChatExporter.Cli/Commands/Base/ExportCommandBase.cs

@@ -169,8 +169,7 @@ public abstract class ExportCommandBase : DiscordCommandBase
             throw new CommandException(
                 "Attempted to export multiple channels, but the output path is neither a directory nor a template. "
                     + "If the provided output path is meant to be treated as a directory, make sure it ends with a slash. "
-                    + "Provided output path: "
-                    + OutputPath
+                    + $"Provided output path: '{OutputPath}'."
             );
         }