Core bug fixes and improvements

Core/Extensions/StartupExtension.cs

@@ -6,8 +6,6 @@ namespace Kruzya.TelegramBot.Core.Extensions
     public static class StartupExtension
     {
         public static IServiceCollection AddQueue<T>(this IServiceCollection collection)
-        {
-            return collection.AddSingleton<ConcurrentQueue<T>>();
-        }
+            => collection.AddSingleton<ConcurrentQueue<T>>();
     }
 }

Core/Service/AbstractTimedHostedService.cs

@@ -29,7 +29,7 @@ namespace Kruzya.TelegramBot.Core.Service
         public Task StartAsync(CancellationToken cancellationToken)
         {
             _logger.LogInformation("Message sender service is starting.");
-            _timer = new Timer(Run, null, TimeSpan.Zero, TimeSpan.FromSeconds(1));
+            _timer = new Timer(Run, null, TimeSpan.Zero, TimerPeriod);
 
             return Task.CompletedTask;
         }
@@ -63,7 +63,7 @@ namespace Kruzya.TelegramBot.Core.Service
             }
             finally
             {
-                var timerPeriod = this.TimerPeriod;
+                var timerPeriod = TimerPeriod;
                 _timer?.Change(timerPeriod, timerPeriod);
             }
         }