Here is the interview question prompt, presented for reference.

Can you convert a number to its text equivalent? This is otherwise known as number spelling.

For example, given 1234, we expect to get "one thousand two hundred and thirty four" back.

Constraints

• The given number will have <= 100 digits
• Let n be the number of digits
• Expected time complexity : O(n)
• Expected space complexity : O(n)

You can see the full challenge with visuals at this link.