Merge pull request #22 from santisq/17-improve-indent-extension-metho…

…d-efficiency

improving Indent extension method

src/PSTree/PSTreeExtensions.cs

@@ -1,13 +1,23 @@
-using System.Text.RegularExpressions;
+using System.Text;
+using System.Text.RegularExpressions;
 
 namespace PSTree;
 
 internal static class PSTreeExtensions
 {
     private static readonly Regex s_re = new(@"└|\S", RegexOptions.Compiled);
 
-    internal static string Indent(this string inputString, int indentation) =>
-        new string(' ', (4 * indentation) - 4) + "└── " + inputString;
+    private static readonly StringBuilder s_sb = new();
+
+    internal static string Indent(this string inputString, int indentation)
+    {
+        s_sb.Clear();
+
+        return s_sb.Append(' ', (4 * indentation) - 4)
+            .Append("└── ")
+            .Append(inputString)
+            .ToString();
+    }
 
     internal static PSTreeFileSystemInfo[] ConvertToTree(
         this PSTreeFileSystemInfo[] inputObject)