Digit sum square

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Problem

Given a number abcd (where a,b,c,d are digits)
calculate the digit sum a+b+c+d and concatenate the digit sum
to the original number and calculate the digit sum again.

Required format:
[[digits, sum], sum_2,...]

e.g

123 -> [[1, 2, 3, 6], 12]

Options

no deadline, the server will not save your submission

Sample input:_

Sample output:

[[1, 2, 3, 4, 10], 20, [6, 7, 6, 7, 26], 52, [8, 6, 8, 6, 28], 56, [7, 8, 7, 22], 44, [6, 5, 4, 6, 21], 42, [1, 2, 3, 4, 5, 6, 7, 8, 9, 45], 90]

Ranking

Ruby _

Rank	User	Size	Time	Date	Statistics
1	rotary-o	71	0.0168	2020/09/06 12:39:40	0B / 36B / 31B

Ruby2 _

Rank	User	Size	Time	Date	Statistics
1	rotary-o	70	0.0549	2020/09/06 12:38:35	0B / 37B / 29B

Perl _

Rank	User	Size	Time	Date	Statistics
1	teebee	65	0.0114	2014/07/19 11:19:01	0B / 24B / 40B
2	BioFALSE	135	0.0159	2013/01/27 09:18:12	7B / 29B / 88B

Python _

Rank	User	Size	Time	Date	Statistics
1	Dingledooper	64	0.1175	2021/10/10 06:44:57	0B / 34B / 27B
2	hallvabo	66	0.0176	2013/01/21 04:40:39	0B / 34B / 29B
3	clock	66	0.0273	2013/01/21 14:52:59	0B / 34B / 29B
4	leonid	66	0.0368	2013/10/05 07:11:06	0B / 37B / 26B
5	starmie	66	0.0316	2015/03/04 16:11:30	0B / 34B / 31B
6	mitchs	66	0.0287	2015/10/18 02:33:24	0B / 37B / 26B
7	Erik the Outgolfer	66	0.0523	2021/02/06 03:17:17	0B / 34B / 29B
8	twobit	68	0.0157	2013/01/20 04:47:17	0B / 37B / 28B
9	rolf	68	0.0171	2013/01/22 08:40:52	0B / 37B / 28B

Python3 _

Rank	User	Size	Time	Date	Statistics
1	mitchs	67	0.0550	2015/10/18 02:38:16	0B / 34B / 31B
2	Dingledooper	67	0.1724	2021/10/10 06:47:01	0B / 34B / 31B

K _

Rank	User	Size	Time	Date	Statistics
1	teebee	56	0.0149	2016/04/17 09:31:11	0B / 10B / 44B

C _

Rank	User	Size	Time	Date	Statistics
1	g33k	161	0.0002	2013/01/29 14:09:15	0B / ?B / ?B

Haskell _

Rank	User	Size	Time	Date	Statistics
1	henkma	105	0.0113	2013/01/24 23:27:27	0B / 54B / 43B
2	cojna	110	0.0157	2013/01/24 17:22:36	0B / 56B / 45B

Java _

Rank	User	Size	Time	Date	Statistics
1	rotary-o	156	0.0501	2022/05/05 20:37:49	0B / 79B / 75B

AWK _

Rank	User	Size	Time	Date	Statistics
1	llhuii	76	0.0105	2014/09/22 22:14:14	0B / 22B / 51B
2	teebee	79	0.0106	2014/07/29 16:03:08	0B / 26B / 49B

jq _

Rank	User	Size	Time	Date	Statistics
1	clock	61	0.0110	2015/02/11 19:33:16	0B / 23B / 36B
2	teebee	81	0.0112	2014/12/15 18:04:41	0B / 31B / 47B

bc _

Rank	User	Size	Time	Date	Statistics
1	McBusLuck	110	0.0170	2020/09/01 16:08:20	0B / 47B / 56B

xgawk _

Rank	User	Size	Time	Date	Statistics
1	llhuii	76	0.0108	2014/09/22 22:06:20	0B / 23B / 50B
2	teebee	79	0.0161	2014/07/29 16:08:08	0B / 26B / 49B

Brainfuck _

Rank	User	Size	Time	Date	Statistics
1	mitchs (cheat)	106	0.0249	2015/10/05 02:29:17	11B / 24B / 59B
2	g33k	186	0.0148	2013/01/29 14:12:05	0B / ?B / ?B

gs2 _

Rank	User	Size	Time	Date	Statistics
1	mitchs	9	0.1018	2015/10/11 12:36:46	2B / 3B / 4B

Burlesque _

Rank	User	Size	Time	Date	Statistics
1	teebee	17	0.0122	2014/09/17 06:50:39	0B / 8B / 9B
2	Hendrik	17	0.0125	2014/09/22 19:49:32	0B / 8B / 9B
3	clock	17	0.0120	2015/01/14 01:25:36	0B / 8B / 9B

Scala _

Rank	User	Size	Time	Date	Statistics
1	rotary-o	82	2.1132	2020/09/06 11:45:31	1B / 40B / 38B
2	clock	82	2.1856	2020/09/07 22:56:21	1B / 40B / 38B

Language Ranking_

Rank	Lang	User	Size	Score
1	gs2	mitchs	9	10000
2	Burlesque	teebee	17	5294
3	K	teebee	56	1607
4	jq	clock	61	1475
5	Python	Dingledooper	64	1406
6	Perl	teebee	65	1384
7	Python3	mitchs	67	1343
8	Ruby2	rotary-o	70	1285
9	Ruby	rotary-o	71	1267
10	xgawk	llhuii	76	1184
11	AWK	llhuii	76	1184
12	Scala	rotary-o	82	1097
13	Haskell	henkma	105	857
14	Brainfuck	mitchs (cheat)	106	849
15	bc	McBusLuck	110	818
16	Java	rotary-o	156	576
17	C	g33k	161	559

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