diff --git a/.github/workflows_json/release.json b/.github/workflows/release.json
similarity index 100%
rename from .github/workflows_json/release.json
rename to .github/workflows/release.json
diff --git a/.github/workflows_json/test.json b/.github/workflows/test.json
similarity index 96%
rename from .github/workflows_json/test.json
rename to .github/workflows/test.json
index d8fb271..bb23b94 100644
--- a/.github/workflows_json/test.json
+++ b/.github/workflows/test.json
@@ -2,8 +2,8 @@
     "name": "test",
     "on": {
         "push": {
-            "branches": [
-                "dev"
+            "branches-ignore": [
+                "master"
             ],
             "paths-ignore": [
                 ".git*",
@@ -13,8 +13,7 @@
         },
         "pull_request": {
             "branches": [
-                "master",
-                "dev"
+                "master"
             ],
             "paths-ignore": [
                 ".git*",
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index a7dd708..de841c1 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -1,8 +1,8 @@
 name: test
 on:
     push:
-        branches:
-            - dev
+        branches-ignore:
+            - master
         paths-ignore:
             - .git*
             - '**.md'
@@ -10,7 +10,6 @@ on:
     pull_request:
         branches:
             - master
-            - dev
         paths-ignore:
             - .git*
             - '**.md'
diff --git a/.github/workflows/to_yaml.sh b/.github/workflows/to_yaml.sh
new file mode 100644
index 0000000..cea5c29
--- /dev/null
+++ b/.github/workflows/to_yaml.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+set -eu
+
+cd ${0%/*}
+
+for _v in $(find ./ -maxdepth 1 -type f -name '*.json'); do
+    yq -I 4 -o y ${_v} | head -c -1 > ${_v%.*}.yaml
+done; unset _v
\ No newline at end of file
diff --git a/.github/workflows_json/to_yaml.sh b/.github/workflows_json/to_yaml.sh
deleted file mode 100644
index 4878624..0000000
--- a/.github/workflows_json/to_yaml.sh
+++ /dev/null
@@ -1,6 +0,0 @@
-#!/bin/sh
-set -eu
-
-cd ${0%/*}
-
-yq -o y -I 4 ./${1}.json | head -c -1 > ../workflows/${1}.yaml
\ No newline at end of file
diff --git a/README.md b/README.md
index 1e5c3e5..91097f7 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,8 @@
 # **Arduino Base64**
 ![actions:test](https://github.com/dojyorin/arduino_base64/actions/workflows/test.yaml/badge.svg)
 ![actions:release](https://github.com/dojyorin/arduino_base64/actions/workflows/release.yaml/badge.svg)
+![shields:license](https://img.shields.io/github/license/dojyorin/arduino_base64)
+![shields:release](https://img.shields.io/github/release/dojyorin/arduino_base64)
 
 Convert between binary and base64 encoded string.
 Easily convert sensor raw values, structures, etc...
diff --git a/library.properties b/library.properties
index 418cc0f..86d078f 100644
--- a/library.properties
+++ b/library.properties
@@ -1,6 +1,6 @@
 name=base64_encode
 author=dojyorin
-version=2.0.1
+version=2.0.2
 architectures=*
 includes=arduino_base64.hpp
 sentence=Convert between binary and base64 encoded string.
diff --git a/src/base64.cpp b/src/base64.cpp
index 4797b03..0f6604e 100644
--- a/src/base64.cpp
+++ b/src/base64.cpp
@@ -1,11 +1,11 @@
 #include "./arduino_base64.hpp"
 
 namespace{
-    constexpr char symbols[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+    constexpr char CODE[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 
     uint8_t indexOf(char search){
         for(uint8_t i = 0; i < 64; i++){
-            if(symbols[i] == search){
+            if(::CODE[i] == search){
                 return i;
             }
         }
@@ -36,10 +36,10 @@ void base64::encode(const uint8_t* input, size_t inputLength, char* output){
         bit8x3[position++] = *input++;
 
         if(position == 3){
-            to6x4(bit8x3, bit6x4);
+            ::to6x4(bit8x3, bit6x4);
 
             for(const auto &v: bit6x4){
-                *output++ = symbols[v];
+                *output++ = ::CODE[v];
             }
 
             position = 0;
@@ -51,10 +51,10 @@ void base64::encode(const uint8_t* input, size_t inputLength, char* output){
             bit8x3[i] = 0x00;
         }
 
-        to6x4(bit8x3, bit6x4);
+        ::to6x4(bit8x3, bit6x4);
 
         for(uint8_t i = 0; i < position + 1; i++){
-            *output++ = symbols[bit6x4[i]];
+            *output++ = ::CODE[bit6x4[i]];
         }
 
         while(position++ < 3){
@@ -80,10 +80,10 @@ void base64::decode(const char* input, uint8_t* output){
             break;
         }
 
-        bit6x4[position++] = indexOf(*input++);
+        bit6x4[position++] = ::indexOf(*input++);
 
         if(position == 4){
-            to8x3(bit6x4, bit8x3);
+            ::to8x3(bit6x4, bit8x3);
 
             for(const auto &v: bit8x3){
                 *output++ = v;
@@ -98,7 +98,7 @@ void base64::decode(const char* input, uint8_t* output){
             bit6x4[i] = 0x00;
         }
 
-        to8x3(bit6x4, bit8x3);
+        ::to8x3(bit6x4, bit8x3);
 
         for(uint8_t i = 0; i < position - 1; i++){
             *output++ = bit8x3[i];