Write format_inr(n) that formats a non-negative integer the Indian way: the last 3 digits, then groups of 2. format_inr(12345678) → "1,23,45,678".
format_inr(12345678) → '1,23,45,678'
format_inr(999) → '999'
Submit runs 6 tests, including hidden edge cases.
Run your code to see the output here.