rustlings 6.5.0

Small exercises to get you used to reading and writing Rust code!
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// Calculates the power of 2 using a bit shift.
// `1 << n` is equivalent to "2 to the power of n".
fn power_of_2(n: u8) -> u64 {
    1 << n
}

fn main() {
    // You can optionally experiment here.
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn you_can_assert_eq() {
        // TODO: Test the function `power_of_2` with some values.
        assert_eq!();
        assert_eq!();
        assert_eq!();
        assert_eq!();
    }
}