diff --git a/src/core_ffi/rust_ffi/CMakeLists.txt b/src/core_ffi/rust_ffi/CMakeLists.txt
index cf98055..01c0a94 100644
--- a/src/core_ffi/rust_ffi/CMakeLists.txt
+++ b/src/core_ffi/rust_ffi/CMakeLists.txt
@@ -5,8 +5,8 @@ set(CMAKE_CXX_STANDARD 23)
 
 if (KLSK_DEV_MODE)
   set(KLSK_RUST_FFI_SRC
+      adapter/layout.cc
       adapter/short_code.cc
-      adapter/common_code.cc
       target/cxxbridge/rust_ffi/src/bridge.rs.cc
   )
   add_library(klotski_rs STATIC ${KLSK_RUST_FFI_SRC}) # just for IDE highlight
diff --git a/src/core_ffi/rust_ffi/Cargo.lock b/src/core_ffi/rust_ffi/Cargo.lock
index 50e45cf..9434056 100644
--- a/src/core_ffi/rust_ffi/Cargo.lock
+++ b/src/core_ffi/rust_ffi/Cargo.lock
@@ -76,7 +76,7 @@ dependencies = [
 
 [[package]]
 name = "klotski"
-version = "0.0.1"
+version = "0.0.2"
 dependencies = [
  "cmake",
  "cxx",
diff --git a/src/core_ffi/rust_ffi/Cargo.toml b/src/core_ffi/rust_ffi/Cargo.toml
index c7e7b9d..bebf5d8 100644
--- a/src/core_ffi/rust_ffi/Cargo.toml
+++ b/src/core_ffi/rust_ffi/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "klotski"
-version = "0.0.1"
+version = "0.0.2"
 edition = "2021"
 authors = ["Dnomd343 <dnomd343@gmail.com>"]
 description = "Klotski multifunctional engine with high performance"
diff --git a/src/core_ffi/rust_ffi/adapter/common_code.cc b/src/core_ffi/rust_ffi/adapter/layout.cc
similarity index 62%
rename from src/core_ffi/rust_ffi/adapter/common_code.cc
rename to src/core_ffi/rust_ffi/adapter/layout.cc
index 973689a..8364aed 100644
--- a/src/core_ffi/rust_ffi/adapter/common_code.cc
+++ b/src/core_ffi/rust_ffi/adapter/layout.cc
@@ -1,4 +1,4 @@
-#include "rust_ffi/include/common_code.h"
+#include "rust_ffi/include/layout.h"
 
 #include <mover/mover.h>
 #include <common_code/common_code.h>
@@ -8,11 +8,11 @@ using klotski::codec::CommonCode;
 
 using klotski::mover::MaskMover;
 
+using klotski::ffi::RsLayout;
 using klotski::ffi::RsShortCode;
-using klotski::ffi::RsCommonCode;
 
 // TODO: it seems that cxx.rs not support `std::optional`
-uint64_t klotski::ffi::common_code_from_str(const rust::Str s) {
+uint64_t klotski::ffi::layout_from_str(const rust::Str s) {
     const std::string_view sv {s.data(), s.length()};
     if (const auto ret = CommonCode::from_string(sv); ret.has_value()) {
         return ret.value().unwrap();
@@ -20,48 +20,48 @@ uint64_t klotski::ffi::common_code_from_str(const rust::Str s) {
     return 0x10FFFFFFFF; // return invalid value for now
 }
 
-bool klotski::ffi::common_code_check(const uint64_t val) {
+bool klotski::ffi::layout_check(const uint64_t val) {
     return CommonCode::check(val);
 }
 
-rust::String RsCommonCode::to_string() const noexcept {
+rust::String RsLayout::to_string() const noexcept {
     return CommonCode::unsafe_create(code).to_string();
 }
 
-rust::String RsCommonCode::to_shorten_string() const noexcept {
+rust::String RsLayout::to_shorten_string() const noexcept {
     return CommonCode::unsafe_create(code).to_string(true);
 }
 
-RsShortCode RsCommonCode::to_short_code() const noexcept {
+RsShortCode RsLayout::to_short_code() const noexcept {
     return {CommonCode::unsafe_create(code).to_short_code().unwrap()};
 }
 
-bool RsCommonCode::is_vertical_mirror() const noexcept {
+bool RsLayout::is_vertical_mirror() const noexcept {
     return CommonCode::unsafe_create(code).is_vertical_mirror();
 }
 
-bool RsCommonCode::is_horizontal_mirror() const noexcept {
+bool RsLayout::is_horizontal_mirror() const noexcept {
     return CommonCode::unsafe_create(code).is_horizontal_mirror();
 }
 
-RsCommonCode RsCommonCode::to_vertical_mirror() const noexcept {
+RsLayout RsLayout::to_vertical_mirror() const noexcept {
     return {CommonCode::unsafe_create(code).to_vertical_mirror().unwrap()};
 }
 
-RsCommonCode RsCommonCode::to_horizontal_mirror() const noexcept {
+RsLayout RsLayout::to_horizontal_mirror() const noexcept {
     return {CommonCode::unsafe_create(code).to_horizontal_mirror().unwrap()};
 }
 
-rust::Vec<RsCommonCode> RsCommonCode::next_cases() const noexcept {
+rust::Vec<RsLayout> RsLayout::next_cases() const noexcept {
     std::vector<CommonCode> result;
     auto mover = MaskMover([&result](const RawCode code, uint64_t) {
         result.emplace_back(code.to_common_code());
     });
     mover.next_cases(CommonCode::unsafe_create(code).to_raw_code(), 0);
 
-    rust::Vec<RsCommonCode> vec;
+    rust::Vec<RsLayout> vec;
     for (auto x : result) {
-        vec.emplace_back(RsCommonCode(x.unwrap()));
+        vec.emplace_back(RsLayout(x.unwrap()));
     }
     return vec;
 }
diff --git a/src/core_ffi/rust_ffi/adapter/short_code.cc b/src/core_ffi/rust_ffi/adapter/short_code.cc
index 45b0836..827bd35 100644
--- a/src/core_ffi/rust_ffi/adapter/short_code.cc
+++ b/src/core_ffi/rust_ffi/adapter/short_code.cc
@@ -4,8 +4,8 @@
 
 using klotski::codec::ShortCode;
 
+using klotski::ffi::RsLayout;
 using klotski::ffi::RsShortCode;
-using klotski::ffi::RsCommonCode;
 
 bool klotski::ffi::short_code_check(const uint32_t val) {
     return ShortCode::check(val);
@@ -23,7 +23,7 @@ rust::String RsShortCode::to_string() const noexcept {
     return ShortCode::unsafe_create(code).to_string();
 }
 
-RsCommonCode RsShortCode::to_common_code() const noexcept {
+RsLayout RsShortCode::to_layout() const noexcept {
     return {ShortCode::unsafe_create(code).to_common_code().unwrap()};
 }
 
diff --git a/src/core_ffi/rust_ffi/build.rs b/src/core_ffi/rust_ffi/build.rs
index e4e5af7..ca70170 100644
--- a/src/core_ffi/rust_ffi/build.rs
+++ b/src/core_ffi/rust_ffi/build.rs
@@ -22,8 +22,8 @@ fn main() {
 
         CFG.include_prefix = "rust_ffi";
         cxx_build::bridge("src/bridge.rs")
+            .file("adapter/layout.cc")
             .file("adapter/short_code.cc")
-            .file("adapter/common_code.cc")
             .include("klotski/src/core")
             .flag("-std=c++23")
             .flag("-fno-rtti")
@@ -32,6 +32,6 @@ fn main() {
     }
 
     println!("cargo:rerun-if-changed=src/bridge.rs");
+    println!("cargo:rerun-if-changed=adapter/layout.cc");
     println!("cargo:rerun-if-changed=adapter/short_code.cc");
-    println!("cargo:rerun-if-changed=adapter/common_code.cc");
 }
diff --git a/src/core_ffi/rust_ffi/examples/demo.rs b/src/core_ffi/rust_ffi/examples/demo.rs
index 645fbfc..4277a2a 100644
--- a/src/core_ffi/rust_ffi/examples/demo.rs
+++ b/src/core_ffi/rust_ffi/examples/demo.rs
@@ -1,5 +1,5 @@
+use klotski::Layout;
 use klotski::ShortCode;
-use klotski::CommonCode;
 
 fn short_code_demo() {
     ShortCode::speed_up(false);
@@ -13,14 +13,14 @@ fn short_code_demo() {
     println!("code: {:?}", code.unwrap());
     println!("string: {}", code.to_string());
 
-    println!("common_code: {:?}", code.to_common_code());
+    println!("layout: {:?}", code.to_layout());
 }
 
-fn common_code_demo() {
-    assert!(CommonCode::check(0x1A9BF0C00));
-    let code = CommonCode::create(0x1A9BF0C00).unwrap();
-    assert_eq!(code, CommonCode::from_string("1A9BF0C").unwrap());
-    assert_eq!(code, CommonCode::create(0x1A9BF0C00).unwrap());
+fn layout_demo() {
+    assert!(Layout::check(0x1A9BF0C00));
+    let code = Layout::create(0x1A9BF0C00).unwrap();
+    assert_eq!(code, Layout::from_string("1A9BF0C").unwrap());
+    assert_eq!(code, Layout::create(0x1A9BF0C00).unwrap());
 
     println!("code: {:?}", code.unwrap());
 
@@ -42,6 +42,6 @@ fn main() {
     println!("----------------------------------------------------------------");
     short_code_demo();
     println!("----------------------------------------------------------------");
-    common_code_demo();
+    layout_demo();
     println!("----------------------------------------------------------------");
 }
diff --git a/src/core_ffi/rust_ffi/include/interface.h b/src/core_ffi/rust_ffi/include/interface.h
index 35362e8..db4e8e4 100644
--- a/src/core_ffi/rust_ffi/include/interface.h
+++ b/src/core_ffi/rust_ffi/include/interface.h
@@ -6,11 +6,11 @@ namespace klotski::ffi {
 
 bool short_code_check(uint32_t val);
 
-bool common_code_check(uint64_t val);
+bool layout_check(uint64_t val);
 
 uint32_t short_code_from_str(rust::Str s);
 
-uint64_t common_code_from_str(rust::Str s);
+uint64_t layout_from_str(rust::Str s);
 
 void short_code_speed_up(bool fast_mode);
 
diff --git a/src/core_ffi/rust_ffi/include/common_code.h b/src/core_ffi/rust_ffi/include/layout.h
similarity index 100%
rename from src/core_ffi/rust_ffi/include/common_code.h
rename to src/core_ffi/rust_ffi/include/layout.h
diff --git a/src/core_ffi/rust_ffi/src/bridge.rs b/src/core_ffi/rust_ffi/src/bridge.rs
index f0d5f8e..f897f29 100644
--- a/src/core_ffi/rust_ffi/src/bridge.rs
+++ b/src/core_ffi/rust_ffi/src/bridge.rs
@@ -1,7 +1,7 @@
 #[cxx::bridge(namespace = "klotski::ffi")]
 mod ffi {
     #[derive(Debug)]
-    struct RsCommonCode {
+    struct RsLayout {
         code: u64,
     }
 
@@ -11,37 +11,37 @@ mod ffi {
     }
 
     unsafe extern "C++" {
-        include!("rust_ffi/include/common_code.h");
+        include!("rust_ffi/include/layout.h");
 
         /// only for internal use
-        fn common_code_check(val: u64) -> bool;
+        fn layout_check(val: u64) -> bool;
 
         /// only for internal use
-        fn common_code_from_str(s: &str) -> u64;
+        fn layout_from_str(s: &str) -> u64;
 
-        /// Convert CommonCode to string form.
-        fn to_string(self: &RsCommonCode) -> String;
+        /// Convert Layout to string form.
+        fn to_string(self: &RsLayout) -> String;
 
-        /// Convert CommonCode to shorten string form.
-        fn to_shorten_string(self: &RsCommonCode) -> String;
+        /// Convert Layout to shorten string form.
+        fn to_shorten_string(self: &RsLayout) -> String;
 
-        /// Convert CommonCode to ShortCode.
-        fn to_short_code(self: &RsCommonCode) -> RsShortCode;
+        /// Convert Layout to ShortCode.
+        fn to_short_code(self: &RsLayout) -> RsShortCode;
 
         /// Whether the layout is vertically symmetrical.
-        fn is_vertical_mirror(self: &RsCommonCode) -> bool;
+        fn is_vertical_mirror(self: &RsLayout) -> bool;
 
         /// Whether the layout is horizontally symmetrical.
-        fn is_horizontal_mirror(self: &RsCommonCode) -> bool;
+        fn is_horizontal_mirror(self: &RsLayout) -> bool;
 
         /// Calculate the vertically symmetrical klotski layout.
-        fn to_vertical_mirror(self: &RsCommonCode) -> RsCommonCode;
+        fn to_vertical_mirror(self: &RsLayout) -> RsLayout;
 
         /// Calculate the horizontally symmetrical klotski layout.
-        fn to_horizontal_mirror(self: &RsCommonCode) -> RsCommonCode;
+        fn to_horizontal_mirror(self: &RsLayout) -> RsLayout;
 
-        /// Obtain all next cases in CommonCode.
-        fn next_cases(self: &RsCommonCode) -> Vec<RsCommonCode>;
+        /// Obtain all next cases in Layout.
+        fn next_cases(self: &RsLayout) -> Vec<RsLayout>;
     }
 
     unsafe extern "C++" {
@@ -56,29 +56,29 @@ mod ffi {
         /// Convert ShortCode to string form.
         fn to_string(self: &RsShortCode) -> String;
 
-        /// Convert ShortCode to CommonCode.
-        fn to_common_code(self: &RsShortCode) -> RsCommonCode;
+        /// Convert ShortCode to Layout.
+        fn to_layout(self: &RsShortCode) -> RsLayout;
 
         /// Build the conversion index for ShortCode.
         fn short_code_speed_up(fast_mode: bool);
     }
 }
 
+pub use ffi::RsLayout as Layout;
 pub use ffi::RsShortCode as ShortCode;
-pub use ffi::RsCommonCode as CommonCode;
 
-impl CommonCode {
-    /// Check the validity of the original CommonCode.
+impl Layout {
+    /// Check the validity of the original Layout.
     pub fn check(code: u64) -> bool {
-        ffi::common_code_check(code)
+        ffi::layout_check(code)
     }
 
-    /// Create CommonCode without any check.
+    /// Create Layout without any check.
     pub fn unsafe_create(code: u64) -> Self {
         Self { code }
     }
 
-    /// Create CommonCode with validity check.
+    /// Create Layout with validity check.
     pub fn create(code: u64) -> Option<Self> {
         if Self::check(code) {
             return Some(Self::unsafe_create(code));
@@ -91,9 +91,9 @@ impl CommonCode {
         self.code
     }
 
-    /// Create CommonCode from string form.
+    /// Create Layout from string form.
     pub fn from_string(s: &str) -> Option<Self> {
-        let val = ffi::common_code_from_str(s);
+        let val = ffi::layout_from_str(s);
         if val < 0x10_FFFF_FFFF {
             return Some(Self::unsafe_create(val));
         }
@@ -139,7 +139,7 @@ impl ShortCode {
     }
 }
 
-impl PartialEq for CommonCode {
+impl PartialEq for Layout {
     fn eq(&self, other: &Self) -> bool {
         self.code == other.code
     }
diff --git a/src/core_ffi/rust_ffi/src/lib.rs b/src/core_ffi/rust_ffi/src/lib.rs
index 9a4a73b..9f0a1f7 100644
--- a/src/core_ffi/rust_ffi/src/lib.rs
+++ b/src/core_ffi/rust_ffi/src/lib.rs
@@ -1,4 +1,4 @@
 mod bridge;
 
+pub use bridge::Layout;
 pub use bridge::ShortCode;
-pub use bridge::CommonCode;