diff --git a/src/all_cases/CMakeLists.txt b/src/all_cases/CMakeLists.txt
index 29a672f..b41a565 100644
--- a/src/all_cases/CMakeLists.txt
+++ b/src/all_cases/CMakeLists.txt
@@ -1,4 +1,3 @@
-cmake_minimum_required(VERSION 3.0)
-
 add_library(all_cases all_cases.cc basic_ranges.cc)
+
 target_link_libraries(all_cases utils)
diff --git a/src/all_cases/all_cases.cc b/src/all_cases/all_cases.cc
index ab9adf7..7f8e5b7 100644
--- a/src/all_cases/all_cases.cc
+++ b/src/all_cases/all_cases.cc
@@ -1,6 +1,14 @@
 #include "common.h"
 #include "all_cases.h"
 
+const uint32_t ALL_CASES_SIZE[16] = {
+    2942906, 2260392, 2942906, 0,
+    2322050, 1876945, 2322050, 0,
+    2322050, 1876945, 2322050, 0,
+    2942906, 2260392, 2942906, 0,
+};
+
+/// static variable initialize
 std::mutex AllCases::building;
 bool AllCases::available = false;
 std::vector<uint32_t> AllCases::data[];
@@ -43,7 +51,7 @@ void AllCases::build_data() { // find all cases
         }
         /// head -> 0/1/2 / 4/5/6 / 8/9/10 / 12/13/14
         data[head].reserve(ALL_CASES_SIZE[head]); // memory pre-allocated
-        /// head(4-bits) + basic ranges(32-bits) ==check==> release valid cases
+        /// head(4-bits) + basic ranges(32-bits) --check--> valid cases
         for (uint32_t index = 0; index < basic_ranges.size(); ++index) {
             auto broken_offset = Common::check_range(head, basic_ranges[index]);
             if (broken_offset) { // case invalid
diff --git a/src/all_cases/all_cases.h b/src/all_cases/all_cases.h
index 3884e9b..936a473 100644
--- a/src/all_cases/all_cases.h
+++ b/src/all_cases/all_cases.h
@@ -5,13 +5,6 @@
 #include <cstdint>
 #include "basic_ranges.h"
 
-const uint32_t ALL_CASES_SIZE[16] = {
-    2942906, 2260392, 2942906, 0,
-    2322050, 1876945, 2322050, 0,
-    2322050, 1876945, 2322050, 0,
-    2942906, 2260392, 2942906, 0,
-};
-
 class AllCases : public BasicRanges {
 public:
     static void build();
diff --git a/src/all_cases/basic_ranges.cc b/src/all_cases/basic_ranges.cc
index 9c2a0c5..eed55b1 100644
--- a/src/all_cases/basic_ranges.cc
+++ b/src/all_cases/basic_ranges.cc
@@ -3,6 +3,9 @@
 #include "common.h"
 #include "basic_ranges.h"
 
+const uint32_t BASIC_RANGES_SIZE = 7311921;
+
+/// static variable initialize
 std::mutex BasicRanges::building;
 bool BasicRanges::available = false;
 std::vector<uint32_t> BasicRanges::data;
@@ -63,8 +66,8 @@ void BasicRanges::generate(generate_t info) { // generate specific basic ranges
     constexpr auto MASK_10 = (uint32_t)0b10 << 30;
     constexpr auto MASK_11 = (uint32_t)0b11 << 30;
 
-    /// n4       n3       n2       n1
-    /// 00000000 00000000 00000000 00000000 (32-bits)
+    /// nx:  n4       n3       n2       n1
+    ///      00000000 00000000 00000000 00000000 (32-bits)
     struct build_t {
         uint32_t nx; // (n4, n3, n2, n1)
         uint32_t prefix;
@@ -78,7 +81,7 @@ void BasicRanges::generate(generate_t info) { // generate specific basic ranges
         .offset = 0,
     });
 
-    while (!cache.empty()) { // queue without elements -> work complete
+    while (!cache.empty()) { // queue without element -> work complete
         auto current = cache.front();
         if (!current.nx) { // both n1, n2, n3, n4 -> 0
             BasicRanges::data.emplace_back(current.prefix); // release prefix as basic range
diff --git a/src/all_cases/basic_ranges.h b/src/all_cases/basic_ranges.h
index 4fb3378..2b86c89 100644
--- a/src/all_cases/basic_ranges.h
+++ b/src/all_cases/basic_ranges.h
@@ -4,8 +4,6 @@
 #include <vector>
 #include <cstdint>
 
-const uint32_t BASIC_RANGES_SIZE = 7311921;
-
 class BasicRanges {
 public:
     enum Status {
diff --git a/src/benchmark/CMakeLists.txt b/src/benchmark/CMakeLists.txt
index 3f5a7c1..b668aa6 100644
--- a/src/benchmark/CMakeLists.txt
+++ b/src/benchmark/CMakeLists.txt
@@ -1 +1 @@
-add_library(benchmark benchmark.cc)
+add_library(benchmark chore.cc benchmark.cc)
diff --git a/src/benchmark/benchmark.cc b/src/benchmark/benchmark.cc
index db27da4..1099bd4 100644
--- a/src/benchmark/benchmark.cc
+++ b/src/benchmark/benchmark.cc
@@ -1,39 +1,36 @@
 #include "benchmark.h"
+#include "all_cases.h"
 
-#include "basic_ranges.h"
-
-const char split_line[] = "------------------------";
-
-
+const char line[] = "------------------------";
 
 void Benchmark::basic_ranges(std::ostream &out) {
-    out << split_line << std::endl;
+    out << line << std::endl;
     out << "Basic Ranges Benchmark" << std::endl;
     if (BasicRanges::status() != BasicRanges::NO_INIT) {
-        out << "already built -> skip" << std::endl;
-        out << split_line << std::endl;
+        out << "already built -> " << color_red("skip") << std::endl;
+        out << line << std::endl;
         return;
     }
+    /// start benchmark process
     auto start = clock();
     BasicRanges::build();
-//    time_ms(start, out);
-//    out << time_ms_(start);
-    out << time_ms_str(start);
-    out << std::endl << split_line << std::endl;
-}
-
-long Benchmark::time_ms_(clock_t start) {
-    return (clock() - start) * 1000 / CLOCKS_PER_SEC;
-}
-
-void Benchmark::time_ms(clock_t start, std::ostream &out) {
-    out << (clock() - start) * 1000 / CLOCKS_PER_SEC << "ms";
+    out << "time -> " << time_ms(start) << std::endl;
+    out << line << std::endl;
 }
 
-void Benchmark::time_us(clock_t start, std::ostream &out) {
-    out << (clock() - start) * 1000000 / CLOCKS_PER_SEC << "us";
-}
-
-std::string Benchmark::time_ms_str(clock_t start) {
-    return std::string("\033[32m") + std::to_string((clock() - start) * 1000 / CLOCKS_PER_SEC) + "ms\033[0m";
+void Benchmark::all_cases(std::ostream &out) {
+    out << line << std::endl;
+    out << "All Cases Benchmark" << std::endl;
+    if (AllCases::status() != AllCases::NO_INIT) {
+        out << "already built -> " << color_red("skip") << std::endl;
+        out << line << std::endl;
+        return;
+    }
+    /// preparing benchmark data
+    BasicRanges::build();
+    /// start benchmark process
+    auto start = clock();
+    AllCases::build();
+    out << "time -> " << time_ms(start) << std::endl;
+    out << line << std::endl;
 }
diff --git a/src/benchmark/benchmark.h b/src/benchmark/benchmark.h
index 749e5fd..5daa6b1 100644
--- a/src/benchmark/benchmark.h
+++ b/src/benchmark/benchmark.h
@@ -4,15 +4,17 @@
 
 class Benchmark {
 public:
-
-
+    static void all_cases(std::ostream &out);
     static void basic_ranges(std::ostream &out);
 
-    static inline void time_ms(clock_t start, std::ostream &out);
-    static inline void time_us(clock_t start, std::ostream &out);
-
-    static inline long time_ms_(clock_t start);
-
-    static inline std::string time_ms_str(clock_t start);
+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);
 };
diff --git a/src/benchmark/chore.cc b/src/benchmark/chore.cc
new file mode 100644
index 0000000..195d516
--- /dev/null
+++ b/src/benchmark/chore.cc
@@ -0,0 +1,43 @@
+#include "benchmark.h"
+
+/// 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";
+}
+
+/// 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_ns(clock_t start) {
+    return color_green(
+        std::to_string((clock() - start) * 1000 * 1000 * 1000 / CLOCKS_PER_SEC) + "us"
+    );
+}
diff --git a/src/main.cc b/src/main.cc
index a56faa9..5290ba6 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -22,6 +22,11 @@ int main() {
 
 //    BasicRanges::build();
 
+//    Benchmark::basic_ranges(std::cout);
+//    std::cout << std::endl;
+    Benchmark::all_cases(std::cout);
+
+    std::cout << std::endl;
     Benchmark::basic_ranges(std::cout);
 
     return 0;