fix code duplication

[lg2de]

Fixes #12

[codecov-io]

Codecov Report

Merging #25 into master will increase coverage by 0.06%.
The diff coverage is 99.58%.

@@            Coverage Diff             @@
##           master      #25      +/-   ##
==========================================
+ Coverage   86.16%   86.23%   +0.06%     
==========================================
  Files          28       29       +1     
  Lines        2689     2564     -125     
  Branches      361      337      -24     
==========================================
- Hits         2317     2211     -106     
+ Misses        298      286      -12     
+ Partials       74       67       -7

Impacted Files	Coverage Δ
src/SimpleAccounting/Reports/ReportBase.cs	100% <100%> (ø)
...impleAccounting/Reports/TotalsAndBalancesReport.cs	100% <100%> (+1.32%)	⬆️
src/SimpleAccounting/Reports/TotalJournalReport.cs	100% <100%> (+2.77%)	⬆️
...c/SimpleAccounting/Reports/AccountJournalReport.cs	98.03% <100%> (+1.63%)	⬆️
...rc/SimpleAccounting/Presentation/ShellViewModel.cs	83.06% <100%> (-0.03%)	⬇️
...rc/SimpleAccounting/Reports/AnnualBalanceReport.cs	92.8% <98.41%> (+0.81%)	⬆️

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