Add StringUtils.SplitInTwo & use it in RequestHandlerBase

Core/Handling/RequestHandlerBase.cs

@@ -7,6 +7,7 @@
 using CefSharp.Handler;
 using TweetDuck.Core.Handling.General;
 using TweetDuck.Core.Utils;
+using TweetLib.Core.Utils;
 
 namespace TweetDuck.Core.Handling{
     class RequestHandlerBase : DefaultRequestHandler{
@@ -21,21 +22,13 @@ public static void LoadResourceRewriteRules(string rules){
             TweetDeckHashes.Clear();
 
             foreach(string rule in rules.Replace(" ", "").ToLower().Split(',')){
-                string[] split = rule.Split('=');
+                var (key, hash) = StringUtils.SplitInTwo(rule, '=') ?? throw new ArgumentException("A rule must have one '=' character: " + rule);
 
-                if (split.Length == 2){
+                if (hash.All(chr => char.IsDigit(chr) || (chr >= 'a' && chr <= 'f'))){
-                    string key = split[0];
+                    TweetDeckHashes.Add(key, hash);
-                    string hash = split[1];
-
-                    if (hash.All(chr => char.IsDigit(chr) || (chr >= 'a' && chr <= 'f'))){
-                        TweetDeckHashes.Add(key, hash);
-                    }
-                    else{
-                        throw new ArgumentException("Invalid hash characters: "+rule);
-                    }
                 }
                 else{
-                    throw new ArgumentException("A rule must have exactly one '=' character: "+rule);
+                    throw new ArgumentException("Invalid hash characters: " + rule);
                 }
             }
         }

lib/TweetLib.Core/Utils/StringUtils.cs

@@ -6,6 +6,16 @@ namespace TweetLib.Core.Utils{
     public static class StringUtils{
         public static readonly string[] EmptyArray = new string[0];
 
+        public static (string before, string after)? SplitInTwo(string str, char search, int startIndex = 0){
+            int index = str.IndexOf(search, startIndex);
+
+            if (index == -1){
+                return null;
+            }
+
+            return (str.Substring(0, index), str.Substring(index + 1));
+        }
+
         public static string ExtractBefore(string str, char search, int startIndex = 0){
             int index = str.IndexOf(search, startIndex);
             return index == -1 ? str : str.Substring(0, index);