easycsv | golang package which provides easy API | CSV Processing library

I would like to combine data frames in the global environment according to the pattern in their name, and simultaneously add the name of the file they are originally from.

My problem is that I have originally a zip file, with over 20 text files in the main folder and sub-folders, which observe mainly two different scenarios: "test" and "train". Hence, I decided to first read ALL of the txt files into R, create two different lists of df names which either have "test" or "train" pattern and using those lists merge the dataframes into two main dataframes. Now, I need to combine those dataframes according to the names in the list, but the rbind just creates another list of their names - how to make rbind treat inputs as objects from the name list, not strings?

Moreover, rbind would combine the dfs without an opportunity to add the variable of their column names - maybe there is a solution which lets to simultaneously combine dfs and add the df name as a column variable?

What I did so far: