/*
  Forum: https://forum.arduino.cc/t/is-there-better-way-to-remove-n-character-from-serial-buffer-while-executing-serial-readbytesuntil-function/1197775 
  Wokwi: https://wokwi.com/projects/383447769467596801
*/

//char myData[8];
char myData[8];

void setup()
{
  Serial.begin(9600);   //to enable serial link between PC, SM, IDE, UNO
  Serial.println("Input 1234.56 ...");
}

int count;

void loop()
{
  byte n = Serial.available();
  if (n != 0) //there is at least one character in Buffer
  {
    byte m = Serial.readBytesUntil('\n', myData, sizeof myData - 1); //'\n' is not saved; m =
    myData[m] = '\0';         //insert null-chracter at the end of string array
    Serial.read();            //to remove '\n' charcater
    //---- reconstruct 1234,56 from the recived ASCII coded 1234.56 -----
    float y = atof(myData);  //atof()= ASCII to float function
    count++;
    Serial.print(count);
    Serial.print("\t");
    Serial.println(y, 2);
  }
}