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char myChar = '\n';  // try with 'a' for a non white space char

void setup() {
  Serial.begin(9600);

  if (isSpace(myChar)) {  // tests if myChar is a white-space character
    Serial.println("The character is white-space");
  } else {
    Serial.println("The character is not white-space");
  }
}

void loop() {
}