String incom_Msg;


void setup() 
{
  Serial.begin(9600);
  Serial.println("Enter text");

}

void loop()
{
    if(Serial.available()>0)
    {
       //incom_Msg = Serial.readString();
       //Serial.println(incom_Msg);
       //Serial.print("msg lengthbefore space remove : ");
       //Serial.println(incom_Msg.length());
       while(incom_Msg.indexOf("  ") >= 0 )
          {
              
              Serial.print("One double space found @ ");
              Serial.println(incom_Msg.indexOf("  "));
              incom_Msg.replace("  "," ");
              delay(100);
              Serial.println("and replaced with single space");
              Serial.println(incom_Msg);
              Serial.println(incom_Msg.length());
              
          }

            Serial.println(incom_Msg);
            Serial.print("msg lengthbefore space remove : ");
            Serial.println(incom_Msg.length());

            /*
            // to remove Newline character
            if(incom_Msg.indexOf("\n") >= 0)
            {
                incom_Msg.replace("\n","");
                Serial.println("New line character found and removed");
            }

            
            // to remove Carriage return character
            if(incom_Msg.indexOf("\r") >= 0)
            {
                incom_Msg.replace("\r","");
                Serial.println("Carriage return character found and removed");
            }

            incom_Msg.trim();   // to remove leading space
            */
      }

}