diff --git a/src/cli/src/main.rs b/src/cli/src/main.rs
index 46bc784..fc18b3d 100644
--- a/src/cli/src/main.rs
+++ b/src/cli/src/main.rs
@@ -1,5 +1,5 @@
 extern crate klotski_ffi;
 
 fn main() {
-    println!("{:#?}", klotski_ffi::load_version());
+    println!("{:#?}", klotski_ffi::load_metadata());
 }
diff --git a/src/rust_ffi/src/core.rs b/src/rust_ffi/src/core.rs
new file mode 100644
index 0000000..9d2c9eb
--- /dev/null
+++ b/src/rust_ffi/src/core.rs
@@ -0,0 +1,26 @@
+/// Klotski c-style API convert by bindgen.
+/// Core module expose these interfaces for abstraction.
+
+pub mod Core {
+    #![allow(dead_code)]
+    #![allow(non_snake_case)]
+    #![allow(non_camel_case_types)]
+    #![allow(non_upper_case_globals)]
+    include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+
+    use std::ffi::{c_char, CStr};
+
+    pub trait CStringDump {
+        fn dump(&self) -> String;
+    }
+
+    impl CStringDump for *const c_char {
+        fn dump(&self) -> String {
+            let cstr: &CStr;
+            unsafe {
+                cstr = CStr::from_ptr(*self);
+            }
+            String::from(cstr.to_str().unwrap())
+        }
+    }
+}
diff --git a/src/rust_ffi/src/lib.rs b/src/rust_ffi/src/lib.rs
index 95cc2ad..498f4f2 100644
--- a/src/rust_ffi/src/lib.rs
+++ b/src/rust_ffi/src/lib.rs
@@ -1,46 +1,4 @@
-#![allow(non_snake_case)]
-#![allow(non_camel_case_types)]
-#![allow(non_upper_case_globals)]
-include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+mod core;
+mod metadata;
 
-use std::env;
-use std::ffi::{c_char, CStr};
-
-#[derive(Debug)]
-pub struct Version {
-    pub author: String,
-    pub system: String,
-    pub version: String,
-    pub compiler: String,
-    pub commit_id: String,
-    pub build_time: String,
-    pub project_url: String,
-}
-
-pub trait CStringDump {
-    fn dump(&self) -> String;
-}
-
-impl CStringDump for *const c_char {
-    fn dump(&self) -> String {
-        let cstr: &CStr;
-        unsafe {
-            cstr = CStr::from_ptr(*self);
-        }
-        String::from(cstr.to_str().unwrap())
-    }
-}
-
-pub fn load_version() -> Version {
-    unsafe {
-        Version {
-            author: get_author().dump(),
-            system: get_system_info().dump(),
-            version: get_version().dump(),
-            compiler: get_compiler_info().dump(),
-            commit_id: get_commit_id().dump(),
-            build_time: get_build_time().dump(),
-            project_url: get_project_url().dump(),
-        }
-    }
-}
+pub use metadata::load_metadata;
diff --git a/src/rust_ffi/src/metadata.rs b/src/rust_ffi/src/metadata.rs
new file mode 100644
index 0000000..f815509
--- /dev/null
+++ b/src/rust_ffi/src/metadata.rs
@@ -0,0 +1,27 @@
+use super::core::Core;
+use Core::CStringDump;
+
+#[derive(Debug)]
+pub struct Metadata {
+    pub author: String,
+    pub system: String,
+    pub version: String,
+    pub compiler: String,
+    pub commit_id: String,
+    pub build_time: String,
+    pub project_url: String,
+}
+
+pub fn load_metadata() -> Metadata {
+    unsafe {
+        Metadata {
+            author: Core::get_author().dump(),
+            system: Core::get_system_info().dump(),
+            version: Core::get_version().dump(),
+            compiler: Core::get_compiler_info().dump(),
+            commit_id: Core::get_commit_id().dump(),
+            build_time: Core::get_build_time().dump(),
+            project_url: Core::get_project_url().dump(),
+        }
+    }
+}