diff --git a/src/common_code/common_code.cc b/src/common_code/common_code.cc
index f83d43b..237a10c 100644
--- a/src/common_code/common_code.cc
+++ b/src/common_code/common_code.cc
@@ -2,22 +2,34 @@
 #include "common.h"
 #include "common_code.h"
 
-uint64_t CommonCode::unwrap() const { // get raw uint64_t code
-    return code;
+uint64_t CommonCode::unwrap() const {
+    return code; // raw uint64_t code
 }
 
-RawCode CommonCode::to_raw_code() const { // convert to raw code
-    return RawCode(*this);
+RawCode CommonCode::to_raw_code() const {
+    return RawCode(*this); // convert to raw code
 }
 
-ShortCode CommonCode::to_short_code() const { // convert to short code
-    return ShortCode(*this);
+ShortCode CommonCode::to_short_code() const {
+    return ShortCode(*this); // convert to short code
 }
 
-CommonCode CommonCode::unsafe_create(uint64_t code) { // create CommonCode without check
-    auto common_code = CommonCode(); // init directly
-    common_code.code = code;
-    return common_code;
+CommonCode CommonCode::create(uint64_t common_code) {
+    return CommonCode(common_code); // create from uint64_t
+}
+
+CommonCode CommonCode::from_raw_code(const RawCode &raw_code) {
+    return raw_code.to_common_code(); // create from raw code
+}
+
+CommonCode CommonCode::from_short_code(const ShortCode &short_code) {
+    return short_code.to_common_code(); // create from short code
+}
+
+CommonCode CommonCode::unsafe_create(uint64_t common_code) { // create without check
+    auto common = CommonCode(); // init directly
+    common.code = common_code;
+    return common;
 }
 
 CommonCode::CommonCode(uint64_t common_code) {
diff --git a/src/common_code/common_code.h b/src/common_code/common_code.h
index 87b2881..65f1cdc 100644
--- a/src/common_code/common_code.h
+++ b/src/common_code/common_code.h
@@ -11,22 +11,23 @@ class ShortCode;
 class CommonCode {
 public:
     uint64_t unwrap() const;
-    static bool check(uint64_t common_code);
-    static CommonCode unsafe_create(uint64_t code);
-
     RawCode to_raw_code() const;
     ShortCode to_short_code() const;
     std::string to_string(bool shorten = false) const;
 
+    static bool check(uint64_t common_code);
+    // TODO: std::cout << CommonCode(...)
+
     explicit CommonCode(uint64_t common_code);
     explicit CommonCode(const RawCode &raw_code);
     explicit CommonCode(const ShortCode &short_code);
     explicit CommonCode(const std::string &common_code);
 
-    // TODO: std::cout << CommonCode(...)
-
-    // TODO: CommonCode::create(...) / CommonCode::from_string(...)
-    // TODO: CommonCode::from_short_code(...) / CommonCode::from_raw_code(...)
+    static CommonCode create(uint64_t common_code);
+    static CommonCode unsafe_create(uint64_t common_code);
+    static CommonCode from_raw_code(const RawCode &raw_code);
+    static CommonCode from_string(const std::string &common_code);
+    static CommonCode from_short_code(const ShortCode &short_code);
 
 private:
     uint64_t code;
diff --git a/src/common_code/serialize.cc b/src/common_code/serialize.cc
index e6a146c..9ce269e 100644
--- a/src/common_code/serialize.cc
+++ b/src/common_code/serialize.cc
@@ -15,6 +15,10 @@ inline uint32_t last_zero_num(uint32_t bin) { // get last zero number
     return binary_count(bin >> 1);
 }
 
+CommonCode CommonCode::from_string(const std::string &common_code) {
+    return CommonCode(common_code); // load from string
+}
+
 std::string CommonCode::to_string(bool shorten) const { // convert uint64_t code to string
     char result[10]; // max length 9-bits
     sprintf(result, "%09lX", code);
diff --git a/src/main.cc b/src/main.cc
index b197170..21f44bc 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -356,8 +356,10 @@ int main() {
 //    std::cout << CommonCode::check_demo(0x0000011CE) << std::endl;
 //    std::cout << CommonCode::check_demo(0x02ED67000) << std::endl;
 
-    std::cout << CommonCode("1a9bf0C0").to_string() << std::endl;
-    std::cout << CommonCode(0x4FEA13400).to_string() << std::endl;
+//    std::cout << CommonCode("1a9bf0C0").to_string() << std::endl;
+//    std::cout << CommonCode(0x4FEA13400).to_string() << std::endl;
+
+    printf("%09lX\n", CommonCode::from_string("1a9bf0c").unwrap());
 
 //    std::cerr << (clock() - start_time) * 1000 / CLOCKS_PER_SEC << "ms" << std::endl;
     std::cerr << (clock() - start_time) * 1000000 / CLOCKS_PER_SEC << "us" << std::endl;