Find and Replace Script for google sheets

I am trying to write a script for find and replace from one column to another. I don't want to see the initial URL in Column B but then find and replace the data into Column C for a spreadsheet.

Column B showshttps://drive.google.com/file/d//view?usp=drivesdk"

I want to replace it in Column C withhttps://lh3.googleusercontent.com/d/=s220?authuser=0

So it's the first and the last part that need to have a find and replace.I want the script to be written so that I can just put in column C =findreplace(B1) or whatever = it needs to be and then it will show up with the new url.

Can someone help me?

Thanks!