@agentjill
Thank you for the PR.
Since there were no issues with the changes, I’ll go ahead and merge them.

@MathNya, the tests fail with following error

error: this argument is passed by value, but not consumed in the function body
--> src/structs/chart.rs:335:33
|
335 | area_chart_series_list: Vec<&str>,
| ^^^^^^^^^ help: consider changing the type to: &[&str]
|
= help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.97.0/index.html#needless_pass_by_value
= note: -D clippy::needless-pass-by-value implied by -D warnings
= help: to override -D warnings add #[allow(clippy::needless_pass_by_value)]

Here the function in reference new_chart(..) is a pub fn, if changes as asked by clippy are implemented then it would break the API surface. Kindly resolve this either denying the lint for this function or accepting the breaking change.