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// Load Wi-Fi library
        #include <ESP8266WiFi.h>

        // Replace with your network credentials
        const char* ssid     = "REPLACE_WITH_YOUR_SSID";
        const char* password = "REPLACE_WITH_YOUR_PASSWORD";

        // Set web server port number to 80
        WiFiServer server(80);

        // Variable to store the HTTP request
        String header;

        // Auxiliar variables to store the current output state
        String output5State = "off";
        String output4State = "off";

        // Assign output variables to GPIO pins
        const int output5 = 5;
        const int output4 = 4;

        void setup() {
          Serial.begin(115200);
          // Initialize the output variables as outputs
          pinMode(output5, OUTPUT);
          pinMode(output4, OUTPUT);
          // Set outputs to LOW
          digitalWrite(output5, LOW);
          digitalWrite(output4, LOW);

          // Connect to Wi-Fi network with SSID and password
          Serial.print("Connecting to ");
          Serial.println(ssid);
          WiFi.begin(ssid, password);
          while (WiFi.status() != WL_CONNECTED){
            delay(500);
            Serial.print(".");
          }
          // Print local IP address and start web server
          Serial.println("");
          Serial.println("WiFi connected.");
          Serial.println("IP address: ");
          Serial.println(WiFi.localIP());
          server.begin();
        }

        void loop(){
          WiFiClient client = server.available();   // Listen for incoming clients

          if (client) {                             // If a new client connects,
            Serial.println("New Client.");          // print a message out in the serial port
            String currentLine = "";                // make a String to hold incoming data from the client
            while (client.connected()) {            // loop while the client's connected
              if (client.available()) {             // if there's bytes to read from the client,
                char c = client.read();             // read a byte, then
                Serial.write(c);                    // print it out the serial monitor
                header += c;
                if (c == 'n') {                    // if the byte is a newline character
                  // if the current line is blank, you got two newline characters in a row.
                  // that's the end of the client HTTP request, so send a response:
                  if (currentLine.length() == 0) {
                    // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
                    // and a content-type so the client knows what's coming, then a blank line:
                    client.println("HTTP/1.1 200 OK");
                    client.println("Content-type:text/html");
                    client.println("Connection: close");
                    client.println();

                    // turns the GPIOs on and off
                    if (header.indexOf("GET /5/on") >= 0) {
                      Serial.println("GPIO 5 on");
                      output5State = "on";
                      digitalWrite(output5, HIGH);
                    } else if (header.indexOf("GET /5/off") >= 0) {
                      Serial.println("GPIO 5 off");
                      output5State = "off";
                      digitalWrite(output5, LOW);
                    } else if (header.indexOf("GET /4/on") >= 0) {
                      Serial.println("GPIO 4 on");
                      output4State = "on";
                      digitalWrite(output4, HIGH);
                    } else if (header.indexOf("GET /4/off") >= 0) {
                      Serial.println("GPIO 4 off");
                      output4State = "off";
                      digitalWrite(output4, LOW);
                    }

                    // Display the HTML web page
                    client.println("<!DOCTYPE html><html>");
                    client.println("<head><meta name="viewport" content="width=device-width, initial-scale=1">");
                    client.println("<link rel="icon" href="data:,">");
                    // CSS to style the on/off buttons
                    // Feel free to change the background-color and font-size attributes to fit your preferences
                    client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
                    client.println(".button { background-color: #195B6A; border: none; color: white; padding: 16px 40px;");
                    client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
                    client.println(".button2 {background-color: #77878A;}</style></head>");

                    // Web Page Heading
                    client.println("<body><h1>ESP8266 Web Server</h1>");

                    // Display current state, and ON/OFF buttons for GPIO 5
                    client.println("<p>GPIO 5 - State " + output5State + "</p>");
                    // If the output5State is off, it displays the ON button
                    if (output5State=="off")
                    {
                      client.println("<p><a href="/5/on"><buttonclass="button">ON</button></a></p>");
                    } else {
                      client.println("<p><a href="/5/off"><button class="button button2">OFF</button></a></p>");
                    }

                    // Display current state, and ON/OFF buttons for GPIO 4
                    client.println("<p>GPIO 4 - State " + output4State </p>");
                    // If the output4State is off, it displays the ON button
                    if (output4State=="off") {
                      client.println("<p><a href="/4/on"><button class="button">ON</button></a></p>");
                    } else {
                      client.println("<p><a href="/4/off"><button class="button button2">OFF</button></a></p>");
                    }
                    client.println("</body></html>");

                    // The HTTP response ends with another blank line
                    client.println();
                    // Break out of the while loop
                break;
                  }
else { // if you got a newline, then clear currentLine
                    currentLine = "";
                  }
                } else if (c != 'r') {  // if you got anything else but a carriage return character,
                  currentLine += c;      // add it to the end of the currentLine
                }
              }
            }
            // Clear the header variable
            header = "";
            // Close the connection
            client.stop();
            Serial.println("Client disconnected.");
            Serial.println("");
          }
      }

The IDE iS thowing me this error

    cc1plus.exe: out of memory allocating 32764 bytes


    cc1plus.exe: out of memory allocating 65536 bytes

    exit status 1
    Error compiling for board Generic ESP8266 Module.

Hardware Connections are following :-
arduino 3.3V  -> ESP8266 Vcc
arduino 3.3 V -> ESP8266 CH_PD
arduino GND   -> GPIO 0
arduino GND   -> GND