diff --git a/bin/main.cpp b/bin/main.cpp
index 52bd8ac..eb8e1a4 100644
--- a/bin/main.cpp
+++ b/bin/main.cpp
@@ -20,6 +20,7 @@
 #include "security/uuid.hpp"
 #include "security/is_string.hpp"
 #include "security/is_link.hpp"
+#include "string/utf8_len.hpp"
 
 // for example
 int f(int a)
@@ -318,4 +319,16 @@ int main(int argc, char *argv[])
     if (!hack::security::is_link(link))
       hack::error()("no link");
   }
+
+  hack::log()("============================================================");
+  hack::log()("string::utf8_size");
+  
+  {// ex: utf8_size
+    std::string str = "hi hi";
+    auto s = hack::string::utf8_len(str);
+    hack::log()(s);
+
+    s = hack::string::utf8_len("asdf");
+    hack::log()(s);
+  }
 }
diff --git a/meson.build b/meson.build
index 25a8b3a..338f415 100644
--- a/meson.build
+++ b/meson.build
@@ -1,31 +1,42 @@
 project(
   'hack', 
   'cpp', 
-  version : '0.0.1', 
-  default_options : ['cpp_std=c++20']
-)
+  version : run_command('jq', '-r', '.version', join_paths(meson.source_root(), 'props.json'), check: true).stdout().strip(),
+  default_options : [
+    'warning_level=1',
+    'optimization=3',
+    'default_library=static',
+    'cpp_std=c++20',
+])
 
 add_project_arguments (
   '-Wpedantic',
-  '-Wshadow', 
+  '-Wno-shadow', 
+  '-Wno-unused-but-set-variable',
   '-Wno-comment',
-  '-Wno-gnu-zero-variadic-macro-arguments',
-  '-Wunused-but-set-variable',
+  '-Wno-unused-parameter',
+  '-Wno-unused-value',
+  '-Wno-missing-field-initializers',
+  '-Wno-narrowing',
+  '-Wno-deprecated-enum-enum-conversion',
+  '-Wno-volatile',
   language: 'cpp'
 )
 
 #############################################################
 
-deps = []
-args = []
+deps = [
+  dependency('boost'),
+  dependency('uuid'),
+  subproject('nlohmann_json').get_variable('nlohmann_json_dep')
+]
+
+args = [
+  '-luuid'
+]
+
 inc = []
 
-deps += dependency('boost')
-deps += dependency('uuid')
-deps += subproject('nlohmann_json').get_variable('nlohmann_json_dep')
-
-args += '-luuid'
-
 #############################################################
 
 subdir('src')
diff --git a/props.json b/props.json
new file mode 100644
index 0000000..b960323
--- /dev/null
+++ b/props.json
@@ -0,0 +1,2 @@
+{"version": "0.0.2"}
+
diff --git a/src/math/max.hpp b/src/math/max.hpp
new file mode 100644
index 0000000..54ab845
--- /dev/null
+++ b/src/math/max.hpp
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <type_traits>
+
+namespace hack
+{
+  // std::common_type_t - делает сравнение по правилу тенарного оператора
+  // и выводит низводящий возвращающий тип. Т.е. если в качестве одного из
+  // параметров передалась ссылка, то произойдет низведление до типа ссылки
+  template<typename T, typename U, typename RT = std::common_type_t<T, U>>
+  inline RT max(T a, U b)
+  {
+    return a > b ? a : b;
+  }
+}
diff --git a/src/meson.build b/src/meson.build
index 01581b5..3b2ab4f 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -1,8 +1,6 @@
 inc += include_directories('.')
 
-subdir('string')
 subdir('logger')
 
-deps += string_dep
 deps += logger_dep
 
diff --git a/src/string/meson.build b/src/string/meson.build
deleted file mode 100644
index f246a94..0000000
--- a/src/string/meson.build
+++ /dev/null
@@ -1,13 +0,0 @@
-headers = ['string.hpp', 'string_concat_helper.hpp']
-sources = ['string.cpp']
-
-lib = library(
-  'string',
-  include_directories : inc,
-  sources: [headers, sources]
-)
-
-string_dep = declare_dependency(
-  include_directories: inc,
-  link_with: lib
-)
diff --git a/src/string/string.cpp b/src/string/string.cpp
deleted file mode 100644
index 33fd61f..0000000
--- a/src/string/string.cpp
+++ /dev/null
@@ -1,5 +0,0 @@
-#include "string.hpp"
-
-namespace hack::string
-{
-}
diff --git a/src/string/string.hpp b/src/string/string.hpp
index eb5d93d..00ae825 100644
--- a/src/string/string.hpp
+++ b/src/string/string.hpp
@@ -5,7 +5,6 @@
 #include <iostream>
 #include <tuple>
 
-
 namespace hack::string
 {
   using v_str = std::vector<std::string>;
diff --git a/src/string/utf8_len.hpp b/src/string/utf8_len.hpp
new file mode 100644
index 0000000..86cb195
--- /dev/null
+++ b/src/string/utf8_len.hpp
@@ -0,0 +1,10 @@
+#include <locale>
+#include <codecvt>
+
+namespace hack::string
+{
+  inline std::size_t utf8_len(const std::string& utf8) 
+  { 
+    return std::wstring_convert<std::codecvt_utf8<char32_t>, char32_t>{}.from_bytes(utf8).size(); 
+  }
+}