Stop creating anonymous structures in functions

[k1LoW]

ref #103

I think TestShard is failing less often...

[github-actions]

Code Metrics Report

	main (2336be4)	#110 (c2b0848)	+/-
Coverage	72.6%	72.6%	+0.0%
Code to Test Ratio	1:0.7	1:0.7	-0.0
Test Execution Time	47s	54s	+7s

Details

  |                     | main (2336be4) | #110 (c2b0848) |  +/-  |
  |---------------------|----------------|----------------|-------|
+ | Coverage            |          72.6% |          72.6% | +0.0% |
  |   Files             |             17 |             17 |     0 |
  |   Lines             |           1953 |           1954 |    +1 |
+ |   Covered           |           1418 |           1419 |    +1 |
- | Code to Test Ratio  |          1:0.7 |          1:0.7 |  -0.0 |
  |   Code              |           3766 |           3770 |    +4 |
  |   Test              |           2750 |           2750 |     0 |
- | Test Execution Time |            47s |            54s |   +7s |

Code coverage of files in pull request scope (72.3% → 72.7%)

Files	Coverage	+/-
book.go	72.7%	+0.4%

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Reported by octocov