code: def get_extra_element_count(curr_count, opt_count, extra_allowed_cnt):
      
      if curr_count > opt_count:
          # We still can allow 1 extra count
          if extra_allowed_cnt > 0:
              extra_allowed_cnt -= 1
              extra_cnt = curr_count - opt_count - 1
          else:
              extra_cnt = curr_count - opt_count
      else:
          extra_cnt = 0
      return extra_cnt, extra_allowed_cnt
docs: Evaluate and return extra same element count based on given values.
  
      :key-term:
      group:  In here group can be any base where elements are place
              i.e. replication-group while placing replicas (elements)
              or  brokers while placing partitions (elements).
      element:  Generic term for units which are optimally placed over group.
  
      :params:
      curr_count: Given count
      opt_count:  Optimal count for each group.
      extra_allowed_cnt:  Count of groups which can have 1 extra element
                     _    on each group.