First Initial

Utils/StringUtil.cs

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+using Microsoft.AspNetCore.Hosting;
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using TTSW.Constant;
+using MimeTypes;
+using System.Net.Http;
+using System.Xml.Serialization;
+using System.Xml;
+
+namespace TTSW.Utils
+{
+    public class StringUtil
+    {
+        public StringUtil()
+        {
+
+        }
+
+        public static string DeleteLines(string input, int linesToSkip)
+        {
+            int startIndex = 0;
+            for (int i = 0; i < linesToSkip; ++i)
+                startIndex = input.IndexOf('\n', startIndex) + 1;
+            return input.Substring(startIndex);
+        }
+
+        public static string RemoveLastLine(string str)
+        {
+            return str.Remove(str.TrimEnd().LastIndexOf(Environment.NewLine));
+        }
+    }
+}