diff --git a/src/ini_reader.h b/src/ini_reader.h
index a6b6ffa..fe04616 100644
--- a/src/ini_reader.h
+++ b/src/ini_reader.h
@@ -128,7 +128,7 @@ public:
     /**
     *  @brief Parse a file during initialization.
     */
-    INIReader(const std::string &filePath)
+    explicit INIReader(const std::string &filePath)
     {
         parsed = false;
         ParseFile(filePath);
diff --git a/src/interfaces.cpp b/src/interfaces.cpp
index e45e152..76b9acd 100644
--- a/src/interfaces.cpp
+++ b/src/interfaces.cpp
@@ -134,18 +134,17 @@ const std::vector<UAProfile> UAMatchList = {
 
 bool verGreaterEqual(const std::string &src_ver, const std::string &target_ver)
 {
-    int part_src, part_target;
-    string_size src_pos_beg = 0, src_pos_end = 0, target_pos_beg = 0, target_pos_end = 0;
+    string_size src_pos_beg = 0, src_pos_end, target_pos_beg = 0, target_pos_end;
     while(true)
     {
         src_pos_end = src_ver.find('.', src_pos_beg);
         if(src_pos_end == src_ver.npos)
             src_pos_end = src_ver.size();
-        part_src = std::stoi(src_ver.substr(src_pos_beg, src_pos_end - src_pos_beg));
+        int part_src = std::stoi(src_ver.substr(src_pos_beg, src_pos_end - src_pos_beg));
         target_pos_end = target_ver.find('.', target_pos_beg);
         if(target_pos_end == target_ver.npos)
             target_pos_end = target_ver.size();
-        part_target = std::stoi(target_ver.substr(target_pos_beg, target_pos_end - target_pos_beg));
+        int part_target = std::stoi(target_ver.substr(target_pos_beg, target_pos_end - target_pos_beg));
         if(part_src > part_target)
             break;
         else if(part_src < part_target)
diff --git a/src/logger.cpp b/src/logger.cpp
index 00dcb55..cfd4260 100644
--- a/src/logger.cpp
+++ b/src/logger.cpp
@@ -36,7 +36,7 @@ std::string getTime(int type)
     return std::string(tmpbuf);
 }
 
-void writeLog(int type, std::string content, int level)
+void writeLog(int type, const std::string &content, int level)
 {
     if(level > global_log_level)
         return;
diff --git a/src/logger.h b/src/logger.h
index 0c75aeb..2481da7 100644
--- a/src/logger.h
+++ b/src/logger.h
@@ -36,7 +36,7 @@ int makeDir(const char *path);
 std::string getTime(int type);
 void logInit(bool rpcmode);
 void resultInit();
-void writeLog(int type, std::string content, int level = LOG_LEVEL_VERBOSE);
+void writeLog(int type, const std::string &content, int level = LOG_LEVEL_VERBOSE);
 void logEOF();
 
 /*
diff --git a/src/misc.cpp b/src/misc.cpp
index 851d167..abf11c9 100644
--- a/src/misc.cpp
+++ b/src/misc.cpp
@@ -134,7 +134,7 @@ unsigned char ToHex(unsigned char x)
 
 unsigned char FromHex(unsigned char x)
 {
-    unsigned char y = '\0';
+    unsigned char y;
     if (x >= 'A' && x <= 'Z')
         y = x - 'A' + 10;
     else if (x >= 'a' && x <= 'z')
@@ -208,8 +208,7 @@ std::string base64_encode(const std::string &string_to_encode)
     unsigned int in_len = string_to_encode.size();
 
     std::string ret;
-    int i = 0;
-    int j = 0;
+    int i = 0, j;
     unsigned char char_array_3[3];
     unsigned char char_array_4[4];
 
@@ -256,7 +255,7 @@ std::string base64_decode(const std::string &encoded_string, bool accept_urlsafe
     string_size in_len = encoded_string.size();
     string_size i = 0;
     string_size in_ = 0;
-    unsigned char char_array_4[4], char_array_3[3], uchar = 0;
+    unsigned char char_array_4[4], char_array_3[3], uchar;
     static unsigned char dtable[256], itable[256], table_ready = 0;
     std::string ret;
 
@@ -1157,7 +1156,7 @@ std::string getFormData(const std::string &raw_data)
 std::string UTF8ToCodePoint(const std::string &data)
 {
     std::stringstream ss;
-    int charcode = 0;
+    int charcode;
     for(std::string::size_type i = 0; i < data.size(); i++)
     {
         charcode = data[i] & 0xff;
diff --git a/src/misc.h b/src/misc.h
index 34c9cd2..a22de37 100644
--- a/src/misc.h
+++ b/src/misc.h
@@ -163,7 +163,7 @@ public:
 
     template <typename T> tribool(const T &value) { set(value); }
 
-    tribool(const tribool &value) { *this = value; }
+    explicit tribool(const tribool &value) { *this = value; }
 
     ~tribool() = default;
 
diff --git a/src/nodemanip.cpp b/src/nodemanip.cpp
index 02041c9..91c3fa3 100644
--- a/src/nodemanip.cpp
+++ b/src/nodemanip.cpp
@@ -19,7 +19,7 @@ void copyNodes(std::vector<nodeInfo> &source, std::vector<nodeInfo> &dest)
     std::move(source.begin(), source.end(), std::back_inserter(dest));
 }
 
-int addNodes(std::string link, std::vector<nodeInfo> &allNodes, int groupID, std::string proxy, string_array &exclude_remarks, string_array &include_remarks, string_array &stream_rules, string_array &time_rules, std::string &subInfo, bool authorized, string_map &request_headers)
+int addNodes(std::string link, std::vector<nodeInfo> &allNodes, int groupID, const std::string &proxy, string_array &exclude_remarks, string_array &include_remarks, string_array &stream_rules, string_array &time_rules, std::string &subInfo, bool authorized, string_map &request_headers)
 {
     int linkType = -1;
     std::vector<nodeInfo> nodes;
diff --git a/src/nodemanip.h b/src/nodemanip.h
index c114bb2..4a30659 100644
--- a/src/nodemanip.h
+++ b/src/nodemanip.h
@@ -6,6 +6,6 @@
 
 #include "nodeinfo.h"
 
-int addNodes(std::string link, std::vector<nodeInfo> &allNodes, int groupID, std::string proxy, string_array &exclude_remarks, string_array &include_remarks, string_array &stream_rules, string_array &time_rules, std::string &subInfo, bool authorized, string_map &request_headers);
+int addNodes(std::string link, std::vector<nodeInfo> &allNodes, int groupID, const std::string &proxy, string_array &exclude_remarks, string_array &include_remarks, string_array &stream_rules, string_array &time_rules, std::string &subInfo, bool authorized, string_map &request_headers);
 
 #endif // NODEMANIP_H_INCLUDED
diff --git a/src/speedtestutil.cpp b/src/speedtestutil.cpp
index d42f808..8e35e14 100644
--- a/src/speedtestutil.cpp
+++ b/src/speedtestutil.cpp
@@ -2031,7 +2031,6 @@ void filterNodes(std::vector<nodeInfo> &nodes, string_array &exclude_remarks, st
     }
     */
 
-    bool excluded, included;
     std::vector<std::unique_ptr<pcre2_code, decltype(&pcre2_code_free)>> exclude_patterns, include_patterns;
     std::vector<std::unique_ptr<pcre2_match_data, decltype(&pcre2_match_data_free)>> exclude_match_data, include_match_data;
     unsigned int i = 0;
@@ -2061,8 +2060,7 @@ void filterNodes(std::vector<nodeInfo> &nodes, string_array &exclude_remarks, st
     writeLog(LOG_TYPE_INFO, "Filter started.");
     while(iter != nodes.end())
     {
-        excluded = false;
-        included = false;
+        bool excluded = false, included = false;
         for(i = 0; i < exclude_patterns.size(); i++)
         {
             rc = pcre2_match(exclude_patterns[i].get(), reinterpret_cast<const unsigned char*>(iter->remarks.c_str()), iter->remarks.size(), 0, 0, exclude_match_data[i].get(), NULL);
diff --git a/src/subexport.cpp b/src/subexport.cpp
index 4a87d18..b230bde 100644
--- a/src/subexport.cpp
+++ b/src/subexport.cpp
@@ -1868,7 +1868,6 @@ std::string netchToSSSub(std::string &base_conf, std::vector<nodeInfo> &nodes, c
     std::string plugin, pluginopts;
     std::string protocol, obfs;
     std::string output_content;
-    int port;
 
     rapidjson::Document::AllocatorType &alloc = json.GetAllocator();
     json.SetObject();
@@ -1897,7 +1896,7 @@ std::string netchToSSSub(std::string &base_conf, std::vector<nodeInfo> &nodes, c
 
         remark = x.remarks;
         hostname = x.server;
-        port = (unsigned short)stoi(GetMember(json, "Port"));
+        int port = (unsigned short)stoi(GetMember(json, "Port"));
         password = GetMember(json, "Password");
         method = GetMember(json, "EncryptMethod");
         plugin = GetMember(json, "Plugin");
diff --git a/src/templates.cpp b/src/templates.cpp
index fdb9899..31481db 100644
--- a/src/templates.cpp
+++ b/src/templates.cpp
@@ -308,19 +308,15 @@ int renderClashScript(YAML::Node &base_rule, std::vector<ruleset_content> &rules
                 {
                 case RULESET_CLASH_IPCIDR:
                     has_ipcidr[rule_name] = true;
-                    if(!script)
-                        rules.emplace_back("RULE-SET," + rule_name + "_ipcidr," + rule_group);
                     break;
                 case RULESET_CLASH_DOMAIN:
                     has_domain[rule_name] = true;
-                    if(!script)
-                        rules.emplace_back("RULE-SET," + rule_name + "_domain," + rule_group);
                     break;
                 case RULESET_CLASH_CLASSICAL:
-                    if(!script)
-                        rules.emplace_back("RULE-SET," + rule_name + "," + rule_group);
                     break;
                 }
+                if(!script)
+                    rules.emplace_back("RULE-SET," + rule_name + "," + rule_group);
                 groups.emplace_back(std::move(rule_name));
                 continue;
             }
@@ -420,7 +416,7 @@ int renderClashScript(YAML::Node &base_rule, std::vector<ruleset_content> &rules
                 base_rule["rule-providers"][yaml_key]["url"] = url.substr(1);
             else
                 base_rule["rule-providers"][yaml_key]["url"] = remote_path_prefix + "/getruleset?type=3&url=" + urlsafe_base64_encode(url);
-            base_rule["rule-providers"][yaml_key]["path"] = "./providers/rule-provider_" + x + "_domain.yaml";
+            base_rule["rule-providers"][yaml_key]["path"] = "./providers/rule-provider_" + yaml_key + ".yaml";
             if(interval)
                 base_rule["rule-providers"][yaml_key]["interval"] = interval;
         }
@@ -435,7 +431,7 @@ int renderClashScript(YAML::Node &base_rule, std::vector<ruleset_content> &rules
                 base_rule["rule-providers"][yaml_key]["url"] = url.substr(1);
             else
                 base_rule["rule-providers"][yaml_key]["url"] = remote_path_prefix + "/getruleset?type=4&url=" + urlsafe_base64_encode(url);
-            base_rule["rule-providers"][yaml_key]["path"] = "./providers/rule-provider_" + x + "_ipcidr.yaml";
+            base_rule["rule-providers"][yaml_key]["path"] = "./providers/rule-provider_" + yaml_key + ".yaml";
             if(interval)
                 base_rule["rule-providers"][yaml_key]["interval"] = interval;
         }
@@ -448,7 +444,7 @@ int renderClashScript(YAML::Node &base_rule, std::vector<ruleset_content> &rules
                 base_rule["rule-providers"][yaml_key]["url"] = url.substr(1);
             else
                 base_rule["rule-providers"][yaml_key]["url"] = remote_path_prefix + "/getruleset?type=6&url=" + urlsafe_base64_encode(url);
-            base_rule["rule-providers"][yaml_key]["path"] = "./providers/rule-provider_" + x + "_classical.yaml";
+            base_rule["rule-providers"][yaml_key]["path"] = "./providers/rule-provider_" + yaml_key + ".yaml";
             if(interval)
                 base_rule["rule-providers"][yaml_key]["interval"] = interval;
         }