title: How I can safely check if file exists in S3 bucket using go in lambda?
body: <p>I am working on a service for my project that is used to synchronize Lambdas works in AWS. The idea is to write a TrackerFile module that will store structures on S3. Each time I use the tracker, I will check if there is a file with the name assigned to the called tracker.</p>
  
  <p>I have no idea but how to safely check if a file with a given name exists on S3. can you show a sample piece of code that would be able to return (bool, err) where bool is True if the file exists?</p>