byte button2pin = 2, button3pin = 3;          // configure button pins
unsigned long button3counter, button2counter; // configure button-press counters

unsigned long timer, timeout = 50;            // used in readButton2()
bool currentButtonState, lastButtonRead;      // used in readButton2()

void setup() {
  Serial.begin(115200);
  pinMode(button2pin, INPUT_PULLUP); // pin to button (n.o.) button to gnd
  pinMode(button3pin, INPUT_PULLUP);
  Serial.println("Press button 3 for \"IS BEING\" pressed.\nPress button 2 for \"WAS\" pressed.");
}

void loop() {
  readButton2(); // read the "was pressed" button in a stand-alone function
  readButton3(); // read "is pressed" button
}

void readButton2() {
/* add globals:
    byte buttonPin = 2;
    bool currentButtonState, lastButtonRead; // "is pressed" and "was pressed"
    unsigned long timer; // debounce start time
    unsigned long timeout = 50; // debounce length
*/
  bool currentButtonRead = digitalRead(button2pin);             // read button pin

  if (currentButtonRead != lastButtonRead) {                    // if button pin changes...
    timer = millis();                                           // ...start a timer
    lastButtonRead = currentButtonRead;                         // ... and store current state
  }

  if ((millis() - timer) > timeout) {                           // if button change was longer than debounce timeout
    if (currentButtonState == HIGH && lastButtonRead == LOW) {  // ... and State is "NOT pressed" while Button "IS PRESSED"
      //==================================================
      digitalWrite(LED_BUILTIN, HIGH);                          // The button was pressed...
      showButton(button2pin, ++button2counter);;                // Put actions or function calls here
      digitalWrite(LED_BUILTIN, LOW);
      //==================================================
    }
    currentButtonState = currentButtonRead;                     // update button state
  }
}

void readButton3() {
  if (!digitalRead(button3pin)) { // button is pressed
    digitalWrite(LED_BUILTIN, HIGH); // LED on
    showButton(button3pin, ++button3counter); // increase button count and print
  }
  else(digitalWrite(LED_BUILTIN, LOW)); // LED off
}

void showButton(byte button, unsigned long count) {
  Serial.print("Button ");
  Serial.print(button);                        // print button pin
  Serial.print(button == 3 ? " IS " : " WAS"); // if "3" print "IS", else print "WAS"
  Serial.print(" pressed ");
  Serial.print(count);                         // print button press count
  if (count > 1)
    Serial.println(" times.");
  else
    Serial.println(" time.");
}