add_special_chars       Add special characters to strings
add_whitespace          Add whitespaces
change_case             Change case
duplicate_rows          Duplicate rows and insert them into the
                        dataframe in order or at random
make_missing            Make missing
messy                   Messy
messy_colnames          Make column names messy
messy_datetime_formats
                        Make date(time) formats inconsistent
messy_datetime_tzones   Change the timezone of datetime columns
split_datetimes         Splits date(time) column(s) into multiple
                        columns
