title: Upload file in S3 using boto3 with Dynamic Foldername
body: <p>I have 4 S3 buckets : 
  SourceBucket\folder1\file1 and DestinationBucket1-folder1,
  SourceBucket\folder2\file1 and DestinationBucket2-folder2.
  When I upload the folders, I would like the code to check for folder 
  'DestinationBucket1-folder1' if it exists and then upload the folder1 and files underneath that folder.</p>
  
  <p>I am struggling with S3 KEY. How can I parse S3 KEY and check if the specifice folder exist and  then upload the first folder under SourceBucket?</p>