Question Mark Operator

Write a function parse_and_double that takes a &str, parses it as i32 using ?, doubles it, and returns the result as Result<i32, std::num::ParseIntError>. Test it with "15" and "abc".

Expected output:

text

Double of 15: 30
Failed to parse: invalid digit found in string

Hints:

Use text.parse::<i32>()? — the ? handles the error automatically
Return Ok(n * 2) after parsing
In main, use match to handle both cases