Added general utils class.

Implemented functions for file name legalization.

SweetLib/SweetLib.csproj

@@ -51,6 +51,7 @@
     <Compile Include="Utils\Logger\Message\LogMessageFormatter.cs" />
     <Compile Include="Utils\Logger\Logger.cs" />
     <Compile Include="Utils\Logger\Message\LogMessage.cs" />
+    <Compile Include="Utils\SweetUtils.cs" />
     <Compile Include="Utils\TaskBar\TaskBarProgress.cs" />
   </ItemGroup>
   <ItemGroup />

SweetLib/Utils/SweetUtils.cs

@@ -0,0 +1,43 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SweetLib.Utils
+{
+    /// <summary>
+    /// A generic class containing useful methods.
+    /// </summary>
+    public static class SweetUtils
+    {
+        public static char DefaultFileNameReplaceChar { get; set; } = '-';
+
+        /// <summary>
+        /// Legalizes a file name with the <see cref="DefaultFileNameReplaceChar"/> character.
+        /// </summary>
+        /// <param name="fileName">File name to legalize.</param>
+        /// <returns>Legalized file name.</returns>
+        public static string LegalizeFilename(string fileName)
+        {
+            return LegalizeFilename(fileName, '-');
+        }
+
+        /// <summary>
+        /// Legalizes a file name by a given replace character.
+        /// </summary>
+        /// <param name="fileName">File name to legalize.</param>
+        /// <param name="replaceChar">Character to be used as replace character.</param>
+        /// <returns>Legalized file name.</returns>
+        public static string LegalizeFilename(string fileName, char replaceChar)
+        {
+            var invalidChars = System.IO.Path.GetInvalidFileNameChars();
+
+            if(invalidChars.Contains(replaceChar))
+                throw new IOException($"Replace character {replaceChar} is an invalid file name character.");
+
+            return invalidChars.Aggregate(fileName, (current, c) => current.Replace(c, replaceChar));
+        }
+    }
+}