113 sheet funs

[jmbarbone]

resolves #113

[codecov-commenter]

Codecov Report

Merging #183 (9d36b49) into main (d5a8118) will decrease coverage by 3.56%.
The diff coverage is 78.53%.

❗ Current head 9d36b49 differs from pull request most recent head 37088d8. Consider uploading reports for the commit 37088d8 to get more accurate results

@@            Coverage Diff             @@
##             main     #183      +/-   ##
==========================================
- Coverage   84.33%   80.77%   -3.57%     
==========================================
  Files          38       36       -2     
  Lines        8637     7447    -1190     
==========================================
- Hits         7284     6015    -1269     
- Misses       1353     1432      +79     

Impacted Files	Coverage Δ
R/helperFunctions.R	76.78% <ø> (+5.04%)	⬆️
R/class-workbook.R	73.48% <75.49%> (-3.11%)	⬇️
R/illegal-characters.R	93.75% <93.75%> (+16.82%)	⬆️
R/class-workbook-utils.R	97.87% <100.00%> (+0.25%)	⬆️
R/class-workbook-wrappers.R	94.06% <100.00%> (+8.72%)	⬆️
R/write.R	80.97% <100.00%> (-0.23%)	⬇️
R/names.R	5.88% <0.00%> (-94.12%)	⬇️
R/wb_styles.R	47.25% <0.00%> (-15.95%)	⬇️
src/styles_xml.cpp	79.43% <0.00%> (-13.85%)	⬇️
R/class-style_mgr.R	78.50% <0.00%> (-10.20%)	⬇️
... and 24 more

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[JanMarvin]

Wonderful! Love it!