🚧 Core improvements

Core/Extensions/HttpClientExtension.cs

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+using System;
+using System.Net.Http;
+using System.Threading.Tasks;
+using Newtonsoft.Json;
+
+namespace Kruzya.TelegramBot.Core.Extensions
+{
+    public static class HttpClientExtension
+    {
+        public static async Task<T> GetJsonAsync<T>(this HttpClient client, Uri requestUri)
+        {
+            var response = await client.GetStringAsync(requestUri);
+            return JsonConvert.DeserializeObject<T>(response);
+        }
+
+        public static async Task<T> GetJsonAsync<T>(this HttpClient client, string requestUri)
+        {
+            var response = await client.GetStringAsync(requestUri);
+            return JsonConvert.DeserializeObject<T>(response);
+        }
+    }
+}

Core/Extensions/ModuleArrayExtension.cs

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+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace Kruzya.TelegramBot.Core.Extensions
+{
+    internal static class ModuleArrayExtension
+    {
+        public static void ConfigureServices(this Module[] modules, IServiceCollection services)
+        {
+            foreach (var module in modules) module.ConfigureServices(services);
+        }
+
+        public static void Configure(this Module[] modules, IApplicationBuilder app, IWebHostEnvironment env)
+        {
+            foreach (var module in modules) module.Configure(app, env);
+        }
+    }
+}

Core/Extensions/StringExtension.cs

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+using System.Web;
+
+namespace Kruzya.TelegramBot.Core.Extensions
+{
+    public static class StringExtension
+    {
+        public static string HtmlEncode(this string content)
+        {
+            return HttpUtility.HtmlEncode(content);
+        }
+
+        public static string HtmlDecode(this string content)
+        {
+            return HttpUtility.HtmlDecode(content);
+        }
+    }
+}

Core/Extensions/UserExtension.cs

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+using System.Text;
+using Telegram.Bot.Types;
+
+namespace Kruzya.TelegramBot.Core.Extensions
+{
+    public static class UserExtension
+    {
+        public static string ToHtml(this User user)
+        {
+            var text = new StringBuilder();
+            text.Append("<a href=\"tg://user?id={member.Id}\">");
+            if (!string.IsNullOrWhiteSpace(user.Username))
+                text.Append(user.Username);
+            else
+                text.Append($"{user.FirstName} {user.LastName}".Trim().HtmlEncode());
+            text.Append("</a>");
+
+            return text.ToString();
+        }
+    }
+}