Grade for Class 4 Assignment

Good job, Sarah.

#### Exercise 1

- No crashes, works as expected. 4 points

#### Exercise 2

- No crashes, works as expected. 4 points
- Clever use of `delete_at`
- Prefer descriptive variable names whenever possible
- Prefer `.first` and `.last` whenever possible

#### Exercise 3

- No crashes, works as expected. 4 points
- Prefer modifier usage of `if condition` statements with a single-line body

#### Exercise 4

- No crashes, works as expected. 4 points
- Looks familiar...

#### Exercise 5

- No crashes, works as expected. 4 points
- Looks familiar...

#### Total

`4 + 4 + 4 + 4 + 4 = 20` :star2: