Bold Words in String

Given an array of keywords words and a string s, make all appearances of all keywords words[i] in s bold. Any letters between <b> and </b> tags become bold. Examples Example 1: Input: words = ["ab","bc"] s = "aabcd" Output: "a<b>abc</b>d" Explanation: "ab" appears at index 1, "bc" appears at index 2. Their marked ranges overlap into one bold region covering indices 1..3. Example 2: Input: words = ["ab","cb"] s = "aabcd" Output: "a<b>ab</b>cd" Constraints 1 <= s.length <= 500 0 <= words.length <= 50 1 <= words[i].length <= 10 s and words[i] consist of lowercase English letters.