[Bug]: a_summary.character creates rows with the same name

[clarkliming]

What happened?

a_summary

with a very simple example

tern:::a_summary(c('a','b','c'))

we can see that the names of the stats are "n", "a", "b", "c", "a", "b", "c", "n_blq". The names are duplicated, and if this is used in rtables we are not able to use cell_values(tt, row_path) to extract the value because the name is duplicated.

sessionInfo()

R version 4.2.2 Patched (2022-11-10 r83330)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 20.04.5 LTS

Matrix products: default
BLAS:   /usr/lib/x86_64-linux-gnu/blas/libblas.so.3.9.0
LAPACK: /usr/lib/x86_64-linux-gnu/lapack/liblapack.so.3.9.0

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] rtables_0.6.4.9003    testthat_3.1.6        magrittr_2.0.3       
[4] formatters_0.5.3.9002

loaded via a namespace (and not attached):
 [1] Rcpp_1.0.10       lattice_0.20-45   tidyr_1.3.0       prettyunits_1.1.1
 [5] ps_1.7.2          rprojroot_2.0.3   digest_0.6.31     utf8_1.2.3       
 [9] mime_0.12         R6_2.5.1          backports_1.4.1   ggplot2_3.4.1    
[13] pillar_1.8.1      Rdpack_2.4        rlang_1.1.1       rstudioapi_0.14  
[17] miniUI_0.1.1.1    callr_3.7.3       urlchecker_1.0.1  Matrix_1.5-3     
[21] checkmate_2.1.0   splines_4.2.2     desc_1.4.2        devtools_2.4.5   
[25] stringr_1.5.0     htmlwidgets_1.6.1 munsell_0.5.0     shiny_1.7.4      
[29] broom_1.0.3       compiler_4.2.2    httpuv_1.6.9      pkgconfig_2.0.3  
[33] pkgbuild_1.4.0    htmltools_0.5.4   tidyselect_1.2.0  tibble_3.2.0     
[37] codetools_0.2-19  fansi_1.0.4       crayon_1.5.2      dplyr_1.1.0      
[41] withr_2.5.0       later_1.3.0       rbibutils_2.2.13  brio_1.1.3       
[45] grid_4.2.2        xtable_1.8-4      gtable_0.3.1      lifecycle_1.0.3  
[49] scales_1.2.1      cli_3.6.0         stringi_1.7.12    cachem_1.0.6     
[53] fs_1.6.1          promises_1.2.0.1  remotes_2.4.2     ellipsis_0.3.2   
[57] vctrs_0.5.2       generics_0.1.3    tools_4.2.2       glue_1.6.2       
[61] purrr_1.0.1       processx_3.8.0    pkgload_1.3.2     fastmap_1.1.0    
[65] survival_3.5-3    colorspace_2.1-0  sessioninfo_1.2.2 memoise_2.0.1    
[69] tern_0.9.1.9002   profvis_0.3.7     usethis_2.1.6

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