refactor: Common components are moved to the Common library.

src/ZonyLrcTools.Common/Infrastructure/Extensions/StringHelper.cs

@@ -0,0 +1,24 @@
+namespace ZonyLrcTools.Common.Infrastructure.Extensions
+{
+    /// <summary>
+    /// 字符串处理相关的工具方法。
+    /// </summary>
+    public static class StringHelper
+    {
+        /// <summary>
+        /// 截断指定字符串末尾的匹配字串。
+        /// </summary>
+        /// <param name="string">待截断的字符串。</param>
+        /// <param name="trimEndStr">需要在末尾截断的字符串。</param>
+        /// <returns>截断成功的字符串实例。</returns>
+        public static string TrimEnd(this string @string, string trimEndStr)
+        {
+            if (@string.EndsWith(trimEndStr, StringComparison.Ordinal))
+            {
+                return @string.Substring(0, @string.Length - trimEndStr.Length);
+            }
+
+            return @string;
+        }
+    }
+}