refactor: Use collection expressions (#38)

Author: MrDave1999

src/Core/Configuration/CPluginEnvConfiguration.cs

@@ -14,7 +14,7 @@ namespace CPlugin.Net;
 /// </remarks>
 public class CPluginEnvConfiguration : CPluginConfigurationBase
 {
-    private static readonly string[] s_separator = { " ", "\t", "\r\n", "\n", "\r" };
+    private static readonly string[] s_separator = [" ", "\t", "\r\n", "\n", "\r"];
 
     /// <summary>
     ///  Initializes a new instance of the <see cref="CPluginEnvConfiguration"/> class.
@@ -26,7 +26,7 @@ public override IEnumerable<string> GetPluginFiles()
     {
         var retrievedValue = Environment.GetEnvironmentVariable("PLUGINS");
         if(retrievedValue is null)
-            return Enumerable.Empty<string>();
+            return [];
 
         var pluginFiles = retrievedValue
             .Split(s_separator, StringSplitOptions.None)

src/Core/Configuration/CPluginJsonConfiguration.cs

@@ -41,8 +41,6 @@ public override IEnumerable<string> GetPluginFiles()
             .GetSection("Plugins")
             .Get<string[]>();
 
-        return values is null ? 
-            Enumerable.Empty<string>() :
-            values.Select(GetPluginPath);
+        return values is null ? [] : values.Select(GetPluginPath);
     }
 }