diff --git a/src/klotski/CMakeLists.txt b/src/klotski/CMakeLists.txt
index d4609bc..dfb2779 100644
--- a/src/klotski/CMakeLists.txt
+++ b/src/klotski/CMakeLists.txt
@@ -17,6 +17,8 @@ include_directories(core)
 include_directories(analyse)
 include_directories(fast_cal)
 
+include_directories(benchmark)
+
 ################################################################
 
 add_subdirectory(utils)
@@ -30,15 +32,17 @@ add_subdirectory(core)
 add_subdirectory(analyse)
 add_subdirectory(fast_cal)
 
+add_subdirectory(benchmark)
+
 ################################################################
 
 add_library(klotski-ffi OBJECT ffi/codec.cc ffi/tmain.cc)
 
-################################################################
-
 add_library(klotski SHARED $<TARGET_OBJECTS:klotski-ffi>)
 #add_library(klotski STATIC $<TARGET_OBJECTS:klotski-core>)
 
+################################################################
+
 target_link_libraries(klotski PRIVATE utils)
 target_link_libraries(klotski PRIVATE all_cases)
 
@@ -50,4 +54,6 @@ target_link_libraries(klotski PRIVATE core)
 target_link_libraries(klotski PRIVATE analyse)
 target_link_libraries(klotski PRIVATE fast_cal)
 
+target_link_libraries(klotski PRIVATE benchmark)
+
 ################################################################
diff --git a/src/klotski/benchmark/benchmark.cc b/src/klotski/benchmark/benchmark.cc
index 1099bd4..cecd9a1 100644
--- a/src/klotski/benchmark/benchmark.cc
+++ b/src/klotski/benchmark/benchmark.cc
@@ -1,36 +1,23 @@
 #include "benchmark.h"
 #include "all_cases.h"
 
-const char line[] = "------------------------";
+using namespace klotski;
 
-void Benchmark::basic_ranges(std::ostream &out) {
-    out << line << std::endl;
-    out << "Basic Ranges Benchmark" << std::endl;
+float Benchmark::basic_ranges(Benchmark::TIME format) {
     if (BasicRanges::status() != BasicRanges::NO_INIT) {
-        out << "already built -> " << color_red("skip") << std::endl;
-        out << line << std::endl;
-        return;
+        return -1; // data already built -> skip
     }
-    /// start benchmark process
     auto start = clock();
     BasicRanges::build();
-    out << "time -> " << time_ms(start) << std::endl;
-    out << line << std::endl;
+    return time_format(start, format);
 }
 
-void Benchmark::all_cases(std::ostream &out) {
-    out << line << std::endl;
-    out << "All Cases Benchmark" << std::endl;
+float Benchmark::all_cases(Benchmark::TIME format) {
     if (AllCases::status() != AllCases::NO_INIT) {
-        out << "already built -> " << color_red("skip") << std::endl;
-        out << line << std::endl;
-        return;
+        return -1; // data already built -> skip
     }
-    /// preparing benchmark data
-    BasicRanges::build();
-    /// start benchmark process
+    BasicRanges::build(); // preparing benchmark data
     auto start = clock();
     AllCases::build();
-    out << "time -> " << time_ms(start) << std::endl;
-    out << line << std::endl;
+    return time_format(start, format);
 }
diff --git a/src/klotski/benchmark/benchmark.h b/src/klotski/benchmark/benchmark.h
index 5daa6b1..79315e2 100644
--- a/src/klotski/benchmark/benchmark.h
+++ b/src/klotski/benchmark/benchmark.h
@@ -2,19 +2,20 @@
 
 #include <ostream>
 
-class Benchmark {
-public:
-    static void all_cases(std::ostream &out);
-    static void basic_ranges(std::ostream &out);
+namespace klotski {
+    class Benchmark {
+    public:
+        enum TIME {
+            S, MS, US, NS
+        };
+        static float all_cases(enum TIME format);
+        static float basic_ranges(enum TIME format);
 
-private:
-    static std::string time_s(clock_t start);
-    static std::string time_ms(clock_t start);
-    static std::string time_us(clock_t start);
-    static std::string time_ns(clock_t start);
-
-    static std::string color_red(const std::string &str);
-    static std::string color_blue(const std::string &str);
-    static std::string color_green(const std::string &str);
-    static std::string color_yellow(const std::string &str);
-};
+    private:
+//        static std::string time_s(clock_t start);
+//        static std::string time_ms(clock_t start);
+//        static std::string time_us(clock_t start);
+//        static std::string time_ns(clock_t start);
+        static float time_format(clock_t start, enum TIME format);
+    };
+}
diff --git a/src/klotski/benchmark/chore.cc b/src/klotski/benchmark/chore.cc
index 9badc44..43cf7ee 100644
--- a/src/klotski/benchmark/chore.cc
+++ b/src/klotski/benchmark/chore.cc
@@ -1,45 +1,66 @@
 #include "benchmark.h"
 
+using namespace klotski;
+
 // TODO: remove std::cout output -> only return benchmark status
 
 /// colorful string
-std::string Benchmark::color_red(const std::string &str) {
-    return std::string("\033[31m") + str + "\033[0m";
-}
-
-std::string Benchmark::color_blue(const std::string &str) {
-    return std::string("\033[36m") + str + "\033[0m";
-}
-
-std::string Benchmark::color_green(const std::string &str) {
-    return std::string("\033[32m") + str + "\033[0m";
-}
-
-std::string Benchmark::color_yellow(const std::string &str) {
-    return std::string("\033[33m") + str + "\033[0m";
-}
+//std::string Benchmark::color_red(const std::string &str) {
+//    return std::string("\033[31m") + str + "\033[0m";
+//}
+//
+//std::string Benchmark::color_blue(const std::string &str) {
+//    return std::string("\033[36m") + str + "\033[0m";
+//}
+//
+//std::string Benchmark::color_green(const std::string &str) {
+//    return std::string("\033[32m") + str + "\033[0m";
+//}
+//
+//std::string Benchmark::color_yellow(const std::string &str) {
+//    return std::string("\033[33m") + str + "\033[0m";
+//}
 
 /// used-time to green string
-std::string Benchmark::time_s(clock_t start) {
-    return color_green(
-        std::to_string((clock() - start) / CLOCKS_PER_SEC) + "s"
-    );
-}
-
-std::string Benchmark::time_ms(clock_t start) {
-    return color_green(
-        std::to_string((clock() - start) * 1000 / CLOCKS_PER_SEC) + "ms"
-    );
-}
-
-std::string Benchmark::time_us(clock_t start) {
-    return color_green(
-        std::to_string((clock() - start) * 1000 * 1000 / CLOCKS_PER_SEC) + "us"
-    );
-}
+//std::string Benchmark::time_s(clock_t start) {
+//    return color_green(
+//        std::to_string((clock() - start) / CLOCKS_PER_SEC) + "s"
+//    );
+//}
+//
+//std::string Benchmark::time_ms(clock_t start) {
+//    return color_green(
+//        std::to_string((clock() - start) * 1000 / CLOCKS_PER_SEC) + "ms"
+//    );
+//}
+//
+//std::string Benchmark::time_us(clock_t start) {
+//    return color_green(
+//        std::to_string((clock() - start) * 1000 * 1000 / CLOCKS_PER_SEC) + "us"
+//    );
+//}
+//
+//std::string Benchmark::time_ns(clock_t start) {
+//    return color_green(
+//        std::to_string((clock() - start) * 1000 * 1000 * 1000 / CLOCKS_PER_SEC) + "us"
+//    );
+//}
 
-std::string Benchmark::time_ns(clock_t start) {
-    return color_green(
-        std::to_string((clock() - start) * 1000 * 1000 * 1000 / CLOCKS_PER_SEC) + "us"
-    );
+float Benchmark::time_format(clock_t start, Benchmark::TIME format) {
+    auto time = float(clock() - start);
+    switch (format) {
+        case S:
+            time *= float(1);
+            break;
+        case MS:
+            time *= float(1000);
+            break;
+        case US:
+            time *= float(1000 * 1000);
+            break;
+        case NS:
+            time *= float(1000 * 1000 * 1000);
+            break;
+    }
+    return time / CLOCKS_PER_SEC;
 }
diff --git a/src/klotski/ffi/tmain.cc b/src/klotski/ffi/tmain.cc
index 1b0b65e..fad95b3 100644
--- a/src/klotski/ffi/tmain.cc
+++ b/src/klotski/ffi/tmain.cc
@@ -1,30 +1,24 @@
-/// WARN: c-style lib should not using `iostream`
-///       using `printf` for screen output in test process
-
 #include <cstdio>
 #include <cstdint>
 
+#include <iostream>
+
 #include "klotski.h"
+//#include "core.h"
 
 #include "common.h"
-//#include "core.h"
+#include "benchmark.h"
+
+using namespace klotski;
 
 void tmain() {
     printf("tmain start\n");
 
-    uint64_t common_code = 0x1A9BC0C00;
-
-    klotski::Common::range_reverse(common_code);
-
-//    uint64_t raw_code = 0x0603EDF5CAFFF5E2;
-
-//    auto core = Core([](uint64_t code, uint64_t mask) {
-//        return;
-//    });
+//    uint64_t common_code = 0x1A9BC0C00;
+//    klotski::Common::range_reverse(common_code);
 
-//    for (uint32_t i = 0; i < 1000000; ++i) {
-//        core.next_cases(raw_code, 0);
-//    }
+    std::cout << Benchmark::basic_ranges(Benchmark::MS) << std::endl;
+    std::cout << Benchmark::all_cases(Benchmark::MS) << std::endl;
 
     printf("tmain exit\n");
 }
diff --git a/src/main.c b/src/main.c
index eaf10ef..afb1497 100644
--- a/src/main.c
+++ b/src/main.c
@@ -2,10 +2,10 @@
 #include "klotski.h"
 
 int main() {
-    printf("cli boot\n");
+//    printf("cli boot\n");
 
     tmain();
 
-    printf("cli exit\n");
+//    printf("cli exit\n");
     return 0;
 }