how to use same code with least modification for LCD and OLED (I2C)

Can any1 suggest me or help me how to modify my LCD code to run on oled (4pin)
this sketch basically counts heartbeats. I am an Amature and a lean learner so please help me out.

#include<LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int in = 8;
int Reset=6;
int start=7;
int count=0,i=0,k=0,rate=0;
unsigned long time2,time1;
unsigned long time;
byte heart[8] =
{
0b00000,
0b01010,
0b11111,
0b11111,
0b11111,
0b01110,
0b00100,
0b00000
};
void setup()
{
lcd.createChar(1, heart);
lcd.begin(16,2);

lcd.print("Heart Beat “);
lcd.write(1);
lcd.setCursor(0,1);
lcd.print(“Monitering”);
pinMode(in, INPUT);
pinMode(Reset, INPUT);
pinMode(start, INPUT);
digitalWrite(Reset, HIGH);
digitalWrite(start, HIGH);
delay(1000);
}
void loop()
{
if(!(digitalRead(start)))
{
k=0;
lcd.clear();
lcd.print(“Please wait…”);
while(k<5)
{
if(digitalRead(in))
{
if(k==0)
time1=millis();
k++;
while(digitalRead(in));
}
}
time2=millis();
rate=time2-time1;
rate=rate/5;
rate=60000/rate;
lcd.clear();
lcd.print(“Heart Beat Rate:”);
lcd.setCursor(0,1);
lcd.print(rate);
lcd.print(” ");
lcd.write(1);
k=0;
rate=0;
}
if(!digitalRead(Reset))
{
rate=0;
lcd.clear();
lcd.print(“Heart Beat Rate:”);
lcd.setCursor(0,1);
lcd.write(1);
lcd.print(rate);
k=0;
}
}