<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def file_exists(original_file):
 """ Check to make sure the original file exists """

    if original_file.startswith("s3://"):
        from filesystem import s3
        return s3.file_exists(original_file)
    else:
        if not os.path.exists(original_file):
            return False
        if not os.path.isfile(original_file):
            return False
    return True