Helper function: copy_xlsx_files

Usage

copy_xlsx_files(
  from_dir,
  to_dir,
  overwrite = FALSE,
  recursive = TRUE,
  file_pattern = "[xX][lL][sS][xX]"
)

from_dir: input directory with xlsx files
to_dir: target directory where to copy the xlsx files
overwrite: should existing files be overwritten (TRUE) otherwise (FALSE) ? (default: FALSE)
recursive: if TRUE recursively find all xlsx files in the directory specified in parameter "from_dir" (default: TRUE)
file_pattern: pattern for identifying xlsx fles (default: "[xX][lL][sS][xX]")