separators used to highlight differences. If sep is empty, then no separator is used. If sep contains one character, it is taken as the unique separator. If sep contains 2 or more characters, the first half of the characters are taken as opening separator and the second half as closing separator.
Attributes
Returns
a (String, String) displaying the differences between each input strings. The used separators are specified by the caller. The string is shortened before and after differences if necessary.