review and change from auto to needed type

src/users/get_all_users.cpp

@@ -7,7 +7,7 @@ void get_all_users(const httplib::Request& request, httplib::Response& response)
 
     if (json_body["token"] == nullptr) {response.set_content("{\"required\":\"[token]\"}", "application/json");return;}
     if (!verify_auth(json_body["token"])) {response.set_content("{\"status\":\"403\"}", "application/json");return;}
-    auto decoded_token = jwt::decode(json_body["token"]);
+    jwt::decoded_jwt<jwt::traits::kazuho_picojson> decoded_token = jwt::decode(json_body["token"]);
     std::string userid = "";
     for (auto& e : decoded_token.get_payload_json()) {
         if (e.first == "userId") {
@@ -20,7 +20,7 @@ void get_all_users(const httplib::Request& request, httplib::Response& response)
     nlohmann::json all_users = nlohmann::json::parse(usersfile);
     usersfile.close();
     nlohmann::json response_user_data = nullptr;
-    for (auto& user : all_users) {
+    for (nlohmann::json& user : all_users) {
         if (user["id"] == userid) {
             response_user_data = user;
         }