Refactor (#94)

CliFx.Analyzers/Utils/Extensions/StringExtensions.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace CliFx.Analyzers.Utils.Extensions
+{
+    internal static class StringExtensions
+    {
+        public static string TrimEnd(
+            this string str,
+            string sub,
+            StringComparison comparison = StringComparison.Ordinal)
+        {
+            while (str.EndsWith(sub, comparison))
+                str = str.Substring(0, str.Length - sub.Length);
+
+            return str;
+        }
+    }
+}