I want to unzip file from one folder to another folder in s3 using lambda function python I have one code for this but in this code file are automatically repeated when we upload file

Question

import json
import boto3
from io import BytesIO
import zipfile

def lambda_handler(event, context):
    # TODO implement
    
    s3_resource = boto3.resource('s3')
    source_bucket = 'source-b12'
    target_bucket = 'destination-b12'

    my_bucket = s3_resource.Bucket(source_bucket)

    for file in my_bucket.objects.all():
        if(str(file.key).endswith('.zip')):
            zip_obj = s3_resource.Object(bucket_name=source_bucket, key=file.key)
            buffer = BytesIO(zip_obj.get()["Body"].read())
            
            z = zipfile.ZipFile(buffer)
            for filename in z.namelist():
                file_info = z.getinfo(filename)
                try:
                    response = s3_resource.meta.client.upload_fileobj(
                        z.open(filename),
                        Bucket=target_bucket,
                        Key=f'{filename}'
                    )
                except Exception as e:
                    print(e)
        else:
            print(file.key+ ' is not a zip file.')