Process all tabs of the XLK input file and output one file per tab
Remove spaces at the beginning and end of all values and replace multiple (double) spaces with a single
space.
Remove all spaces in every row of the 'email' column.
Merge CC1 and CC2 in one column named 'email_cc', joined with ';'
Uppercase all values of the lastname column.
Show duplicate emails (based on the email column) with different light background colors per group,
sorted so that duplicates appear one below the other.
Show email fields in error (those with special characters: <, >, !, ; or without '@') for email,
CC1 and CC2.
Download output as .xlsx once processed (using the original file name plus a tab number).