code: def cp_string(self, source, dest, **kwargs):
          
  
          assert isinstance(source, six.string_types), "source must be a string"
          assert self._is_s3(dest), "Destination must be s3 location"
  
          return self._put_string(source, dest, **kwargs)
docs: Copies source string into the destination location.
  
          Parameters
          ----------
          source: string
              the string with the content to copy
          dest: string
              the s3 location