Fixed backup file names, improved handling of renaming things

DeukBot4/MessageHandlers/ImageBackupHandler.cs

@@ -55,18 +55,20 @@ namespace DeukBot4.MessageHandlers
             {
                 using (var client = new WebClient())
                 {
+                    var attachmentSplit = attachment.Filename.Split('.');
+                    var filename = $"{attachmentSplit[0]}-{DateTime.UtcNow:s}.{attachmentSplit[1]}";
+
                     var content = client.DownloadData(attachment.Url);
-                    var uri = new Uri($"{Settings.URL}/{attachment.Filename}-{DateTime.UtcNow:s}");
+                    var uri = new Uri($"{Settings.URL}/{filename}");
                     client.Credentials = new NetworkCredential(Settings.Username, Settings.Password);
                     try
                     {
                         client.UploadData(uri, "PUT", content);
-                        var attachmentSplit = attachment.Filename.Split('.');
                         var eb = new EmbedBuilder()
                         {
                             Title = "Image Backed Up",
                             Description = $"Image with the name ``{attachment.Filename}`` was backed up as " +
-                                          $"``{attachmentSplit[0]}-{DateTime.UtcNow:s}.{attachmentSplit[1]}``",
+                                          $"``{filename}``",
                             ThumbnailUrl = attachment.Url,
                             Timestamp = DateTime.UtcNow
                         };

DeukBot4/MessageHandlers/MainHandler.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Threading.Tasks;
+using DeukBot4.Utilities;
 using Discord.WebSocket;
 
 namespace DeukBot4.MessageHandlers
@@ -37,10 +38,10 @@ namespace DeukBot4.MessageHandlers
 
         private static async Task DeltaHandler(SocketMessage message)
         {
-            var lower = message.Content.ToLowerInvariant().Split(' ');
+            var lower = message.Content.ToLowerInvariant().RemoveSpecialCharacters().Split(' ');
             foreach (var s in lower)
             {
-                var diff = Utilities.Lehvenstein.LevenshteinDistance(s, "delta");
+                var diff = Lehvenstein.LevenshteinDistance(s, "delta");
                 if (diff <= 1)
                 {
                     await message.Channel.SendMessageAsync("uhh excuse me it's called Origin and it's an art");

DeukBot4/Utilities/StringExtensions.cs

@@ -0,0 +1,17 @@
+using System.Text;
+
+namespace DeukBot4.Utilities
+{
+    public static class StringExtensions
+    {
+        public static string RemoveSpecialCharacters(this string str) {
+            StringBuilder sb = new StringBuilder();
+            foreach (char c in str) {
+                if ((c >= '0' && c <= '9') || (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')) {
+                    sb.Append(c);
+                }
+            }
+            return sb.ToString();
+        }
+    }
+}