button not working

Projects General Guidance
9

well after a long time i started working on it again,
but the problem is the leds are not turning on,
i did chek if the leds do work and they work

here is the code:

const int button = 7;
const int ledg = 0;
const int ledr = 1;
const int led1 = 2;
const int led2 = 3;
const int led3 = 4;
const int led4 = 5;
const int led5 = 6;

int ledstate = 0;

int buttonstate = 0;

long previous = 0;
long interval = 1000;

int ledOn = 0;

void setup() {
  pinMode(button, INPUT);
  pinMode(ledg, OUTPUT);
  pinMode(ledr, OUTPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led5, OUTPUT);
}
void loop() {
  ledstate = digitalRead(led3);
  buttonstate = digitalRead(button);
  unsigned long currentmillis = millis();
  if (currentmillis == interval) {
    ledOn + 1;
    interval + 1000;
  }
  if (ledOn >= 7) {
    ledOn = 0;
  }
  if (ledOn == 1) {
    digitalWrite(led5, LOW);
    digitalWrite(led1, HIGH);
  }
  if (ledOn == 2) {
    digitalWrite(led1, LOW);
    digitalWrite(led2, HIGH);
  }
  if (ledOn == 3) {
    digitalWrite(led2, LOW);
    digitalWrite(led3, HIGH);
  }
  if (ledOn == 4) {
    digitalWrite(led3, LOW);
    digitalWrite(led4, HIGH);
  }
  if (ledOn == 5) {
    digitalWrite(led4, LOW);
    digitalWrite(led5, HIGH);
  }
  if (buttonstate == HIGH && ledstate == HIGH) {
    digitalWrite(ledg, HIGH);
    delay(2000);
    digitalWrite(ledg, LOW);
  }
  if (buttonstate == HIGH && ledstate == LOW) {
    digitalWrite(ledr, HIGH);
    delay(2000);
    digitalWrite(ledr, LOW);
  }
}