Error: 'Function' was not declared in this scope.

Hi, recently started learning Arduino by following a book. I usually figure out errors on my own, but got stuck on this one, so i figured to give it a try on here.
The error is: ‘longBlink’ was not declared in this scope.

// Include button library
#include <Button.h>

// Create a button object
Button btnSos(3);

const byte ledPin = 13;

void setup() {
  // Start button
  btnSos.begin();

  // Use ledpin as output
  pinMode(ledPin, OUTPUT);
}
void shortBlink() {

  // Make a single short blink
  digitalWrite(ledPin, HIGH);
  delay(200);
  digitalWrite(ledPin, LOW);
  delay(200);
}
void longblink() {

  // Make a single long blink
  digitalWrite(ledPin, HIGH);
  delay(600);
  digitalWrite(ledPin, LOW);
  delay(200);
}
void morseBlink(char character) {

  // Translate character to Morse code
  switch (character) {
    case 's':
      shortBlink();
      shortBlink();
      shortBlink();
      break;
    case 'o':
      longBlink();
      longBlink();
      longBlink();
      break;
  }
}
void loop() {

  // Start blinking SOS
  if (!btnSos.released()) {

    // Blink until btnSos is released
    while (!btnSos.released()) {
      morseBlink('s');
      morseBlink('o');
      morseBlink('s');
    }
  }
}

Error:

Sos.ino:42:7: error: 'longBlink' was not declared in this scope

       longBlink();

       ^~~~~~~~~

C:\Users\siver\OneDrive\Dokumenter\Arduino\Sos.ino\Sos.ino.ino:42:7: note: suggested alternative: 'longblink'

       longBlink();

       ^~~~~~~~~

       longblink

exit status 1
'longBlink' was not declared in this scope

void longblink() {Oops

Ahh thanks, what a sloppy mistake. ::slight_smile: