diff --git a/example/web/tdweb/src/index.js b/example/web/tdweb/src/index.js
index 94e92159..d79f3e2f 100644
--- a/example/web/tdweb/src/index.js
+++ b/example/web/tdweb/src/index.js
@@ -9,9 +9,9 @@ const sleep = ms => new Promise(res => setTimeout(res, ms));
  * TDLib in browser
  *
  * TDLib can be used from javascript through the [JSON](https://github.com/tdlib/td#using-json) interface.
- * This is a convenient wrapper around it.  
+ * This is a convenient wrapper around it.
  * Internally it uses TDLib built with emscripten as asm.js or WebAssembly. All work happens in a WebWorker.
- * TdClient itself just sends queries to WebWorker, recieve updates and results from WebWorker.
+ * TdClient itself just sends queries to WebWorker, receive updates and results from WebWorker.
  *
  * <br><br>
  * Differences from TDLib API<br>
diff --git a/td/telegram/DocumentsManager.cpp b/td/telegram/DocumentsManager.cpp
index e47ab748..09e43b86 100644
--- a/td/telegram/DocumentsManager.cpp
+++ b/td/telegram/DocumentsManager.cpp
@@ -136,7 +136,7 @@ std::pair<DocumentsManager::DocumentType, FileId> DocumentsManager::on_get_docum
     if (animated != nullptr || default_document_type == DocumentType::Animation) {
       document_type = DocumentType::Animation;
       file_type = FileType::Animation;
-      default_extension = "mp4";
+      default_extension = Slice("mp4");
     } else if (audio != nullptr || default_document_type == DocumentType::Audio ||
                default_document_type == DocumentType::VoiceNote) {
       bool is_voice_note = default_document_type == DocumentType::VoiceNote;
@@ -146,17 +146,17 @@ std::pair<DocumentsManager::DocumentType, FileId> DocumentsManager::on_get_docum
       if (is_voice_note) {
         document_type = DocumentType::VoiceNote;
         file_type = FileType::VoiceNote;
-        default_extension = "oga";
+        default_extension = Slice("oga");
         file_name.clear();
       } else {
         document_type = DocumentType::Audio;
         file_type = FileType::Audio;
-        default_extension = "mp3";
+        default_extension = Slice("mp3");
       }
     } else if (sticker != nullptr || default_document_type == DocumentType::Sticker) {
       document_type = DocumentType::Sticker;
       file_type = FileType::Sticker;
-      default_extension = "webp";
+      default_extension = Slice("webp");
       owner_dialog_id = DialogId();
       file_name.clear();
       has_webp_thumbnail = td_->stickers_manager_->has_webp_thumbnail(sticker);
@@ -177,7 +177,7 @@ std::pair<DocumentsManager::DocumentType, FileId> DocumentsManager::on_get_docum
         document_type = DocumentType::Video;
         file_type = FileType::Video;
       }
-      default_extension = "mp4";
+      default_extension = Slice("mp4");
     }
   } else if (type_attributes >= 2) {
     LOG(WARNING) << "Receive document with more than 1 type attribute: animated = " << to_string(animated)
diff --git a/td/telegram/net/Session.cpp b/td/telegram/net/Session.cpp
index c7711223..171ab615 100644
--- a/td/telegram/net/Session.cpp
+++ b/td/telegram/net/Session.cpp
@@ -954,14 +954,14 @@ void Session::connection_open_finish(ConnectionInfo *info,
   Slice mode_name;
   if (mode_ == Mode::Tcp) {
     mode = mtproto::SessionConnection::Mode::Tcp;
-    mode_name = "Tcp";
+    mode_name = Slice("Tcp");
   } else {
     if (info->connection_id == 0) {
       mode = mtproto::SessionConnection::Mode::Http;
-      mode_name = "Http";
+      mode_name = Slice("Http");
     } else {
       mode = mtproto::SessionConnection::Mode::HttpLongPoll;
-      mode_name = "HttpLongPoll";
+      mode_name = Slice("HttpLongPoll");
     }
   }
   auto name = PSTRING() << get_name() << "::Connect::" << mode_name << "::" << raw_connection->debug_str_;
diff --git a/tdactor/td/actor/impl/Scheduler-decl.h b/tdactor/td/actor/impl/Scheduler-decl.h
index 95798e11..f8c86318 100644
--- a/tdactor/td/actor/impl/Scheduler-decl.h
+++ b/tdactor/td/actor/impl/Scheduler-decl.h
@@ -5,6 +5,7 @@
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 //
 #pragma once
+
 #include "td/actor/impl/Actor-decl.h"
 #include "td/actor/impl/ActorId-decl.h"
 #include "td/actor/impl/EventFull-decl.h"
diff --git a/tdnet/td/net/HttpReader.cpp b/tdnet/td/net/HttpReader.cpp
index ee312c41..7c4ccaf1 100644
--- a/tdnet/td/net/HttpReader.cpp
+++ b/tdnet/td/net/HttpReader.cpp
@@ -691,10 +691,10 @@ Status HttpReader::parse_head(MutableSlice head) {
   parser.skip('\n');
 
   content_length_ = 0;
-  content_type_ = "application/octet-stream";
+  content_type_ = Slice("application/octet-stream");
   content_type_lowercased_ = content_type_.str();
-  transfer_encoding_ = "";
-  content_encoding_ = "";
+  transfer_encoding_ = Slice();
+  content_encoding_ = Slice();
 
   query_->keep_alive_ = false;
   query_->headers_.clear();
diff --git a/tdutils/td/utils/HttpUrl.cpp b/tdutils/td/utils/HttpUrl.cpp
index 5663045d..b66db14d 100644
--- a/tdutils/td/utils/HttpUrl.cpp
+++ b/tdutils/td/utils/HttpUrl.cpp
@@ -114,7 +114,7 @@ Result<HttpUrl> parse_url(MutableSlice url, HttpUrl::Protocol default_protocol)
     query.remove_suffix(1);
   }
   if (query.empty()) {
-    query = "/";
+    query = Slice("/");
   }
   string query_str;
   if (query[0] != '/') {
diff --git a/tdutils/td/utils/check.cpp b/tdutils/td/utils/check.cpp
index 824e817f..17525d61 100644
--- a/tdutils/td/utils/check.cpp
+++ b/tdutils/td/utils/check.cpp
@@ -7,6 +7,7 @@
 #include "td/utils/check.h"
 
 #include "td/utils/logging.h"
+#include "td/utils/Slice.h"
 
 namespace td {
 namespace detail {
diff --git a/tdutils/td/utils/logging.cpp b/tdutils/td/utils/logging.cpp
index 798678d2..dcfe564e 100644
--- a/tdutils/td/utils/logging.cpp
+++ b/tdutils/td/utils/logging.cpp
@@ -217,13 +217,13 @@ class DefaultLog : public LogInterface {
     switch (log_level) {
       case VERBOSITY_NAME(FATAL):
       case VERBOSITY_NAME(ERROR):
-        color = TC_RED;
+        color = Slice(TC_RED);
         break;
       case VERBOSITY_NAME(WARNING):
-        color = TC_YELLOW;
+        color = Slice(TC_YELLOW);
         break;
       case VERBOSITY_NAME(INFO):
-        color = TC_CYAN;
+        color = Slice(TC_CYAN);
         break;
     }
     TsCerr() << color << slice << TC_EMPTY;