Read Data From Firebase RealTime Database Using NodeMCU ESP8266

/* 
 
 Created by:- Rishi Tiwari
 Website:- TrickSumo.com
 Video Tutorial:- https://youtu.be/nLzC0-VaqDs
 
 Libraries used:- 

https://github.com/mobizt/Firebase-ESP8266/

*/

#include <ESP8266WiFi.h>
#include <FirebaseESP8266.h>
                          
#define FIREBASE_HOST "test.firebaseio.com"                     //Your Firebase Project URL goes here without "http:" , "\" and "/"
#define FIREBASE_AUTH "83Z6iVjTlxjfhjsgjhwerhwqweZxrTXiy0C9" //Your Firebase Database Secret goes here

#define WIFI_SSID "Wifiname-here"                                               //your WiFi SSID for which yout NodeMCU connects
#define WIFI_PASSWORD "Wifipassword-here"                                      //Password of your wifi network 
 

// Declare the Firebase Data object in the global scope
FirebaseData firebaseData;

// Declare global variable to store value
int val=0;


void setup() {

  Serial.begin(115200);                                                      // Select the same baud rate if you want to see the datas on Serial Monitor

  Serial.println("Serial communication started\n\n");  
           
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);                                     //try to connect with wifi
  Serial.print("Connecting to ");
  Serial.print(WIFI_SSID);


  
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }

  
  Serial.println();
  Serial.print("Connected to ");
  Serial.println(WIFI_SSID);
  Serial.print("IP Address is : ");
  Serial.println(WiFi.localIP());                                            //print local IP address
  Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);   // connect to firebase

  Firebase.reconnectWiFi(true);
  delay(1000);
}

void loop() {


// Firebase Error Handling And Reading Data From Specified Path ************************************************

if (Firebase.getInt(firebaseData, "/data")) {                           // On successful Read operation, function returns 1  

    if (firebaseData.dataType() == "int") {                            // print read data if it is integer

      val = firebaseData.intData();
      Serial.println(val);
      Serial.println("\n Change value at firebase console to see changes here."); 
      delay(10000);
      
    }

  } else {
    Serial.println(firebaseData.errorReason());
  }
 }


/* NOTE:
 *  To read value, command is ===> Firebase.getInt(firebaseData, "path"); variable = firebaseData.intData();
 *  
 *  Example                   ===>  Firebase.setInt(firebaseData, "/data", val); val = firebaseData.intData();
 */
          

Hello, I need to get the tag of the node from the user using the Serial monitor in my project. But in the Firebase.getString() function, if I get the tag as a string input and concatenate it with the bucket address string and then input it, it does not retrieve the node's data. However, if I manually input the full address as a string, it is able to retrieve the data. For example,
If the user wants to access the data in the node with the tag "test", which is stored in the "users" bucket, the serial input is given as the string 'test' and it's stored in the variable 'x'. if I write: Firebase.getString(firebaseData, "/users/"+x), it returns 0. But if I write: Firebase.getString(firebaseData, "/users/test"), this returns 1.
What can I do to fix this?