separators are used to highlight differences.
separators are 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, half of them are taken for the opening separator and the rest for the closing separator.
a (String, String) displaying the differences between each input strings. The used separators are specified by the caller.
Given 2 strings and their edit distance matrix, show the operations allowing to go from one string to the other