String Window Doubt

#1

If there is a character whose occurence is more than one in string2 then should the substring of string1 contain that character more than once as well?

#2

@ap8730390,
Yes.

Since you have to find the minimum length substring of the string1 which contains all the characters of string2.

Example:

Input:
ankprittasad
ankitt

Expected Output:
ankpritt