Minimum Covering Substring

Given two strings s and t, return the minimum window substring of s such that every character in t (including duplicates) is present in the window. If there is no such window, return an empty string.

Examples
Input: ["ADOBECODEBANC","ABC"]
Output: "BANC"
Hints

Minimum Covering Substring

Given two strings `s` and `t`, return the minimum window substring of `s` such that every character in `t` (including duplicates) is present in the window. If there is no such window, return an empty string.