Got asked LC hard for Samsara phone

Basically i had a phone interview. The interviewer told me there will be 2 questions and i should complete both in 30 minutes. I couldn't even complete the first question. To me it's an LC Hard but i feel like i missed something out. Basically i approached in an iterative way where for everything nested i push it to a stack then process it. Obviously didn't have time to finish it all. Someone on here told me this is a simple OOP question but I don't see how. What am I missing here? This is the question: We're going to build the beginnings of a markdown processor. Markdown is a markup language that allows you to easily create HTML. > > We ll provide some sample input and desired output. Dont worry too much about edge cases, but feel free to ask if you re unsure or think there s something we ought to consider. Part 1 A markdown processor is capable of handling a multitude of string to html tag formats. For now, we just want to focus on supporting <p/>, <br/>, <blockquote/>, and <del/> tags. Input: String input = "This is a paragraph with a soft\n" + "line break.\n\n" + "This is another paragraph that has\n" + "> Some text that\n" + "> is in a\n" + "> block quote.\n\n" + "This is another paragraph with a ~~strikethrough~~ word."; Expected Output: "<p>This is a paragraph with a soft<br />line break.</p> <p>This is another paragraph that has <br /> <blockquote>Some text that<br />is in a<br />block quote</blockquote> </p> <p>This is another paragraph with a <del>strikethrough</del> word.</p>" Note: It's not important to produce this specific output! We only care if the HTML is valid. */