Wrap Matching Substrings in Bold Tags

During a machine learning engineer phone screen, the coding task was: You are given a string `text` and a list of strings `patterns`. Return a new string where every substring of `text` that matches any string in `patterns` is wrapped in HTML-style bold tags: `<b>` and `</b>`. Rules: - If two matched ranges overlap, they must be merged into one bold segment. - If two matched ranges are adjacent, they should also be merged into one bold segment. - The output should contain the minimum number of bold tag pairs needed to cover all matches. Example 1: - Input: `text = "abcxyz123"`, `patterns = ["abc", "123"]` - Output: `"<b>abc</b>xyz<b>123</b>"` Example 2: - Input: `text = "aaabbcc"`, `patterns = ["aaa", "aab", "bc"]` - Output: `"<b>aaabbc</b>c"` Implement a function that returns the formatted string.