Function display_utils::vertical_unicode_block_bars

pub fn vertical_unicode_block_bars<I>(
    max_height: usize, 
    proportions: I
) -> VerticalUnicodeBlockBars<I::IntoIter> where
    I: IntoIterator<Item = f32>,
    I::IntoIter: Clone, 

Print a sequence of equalizer-style vertical bars using Unicode block characters.

The bars are very high-resolution: 8 states can be represented per character.

Accepts the total maximum height of the bars and an iterator over each bar’s fill percentage.

let expected_output = "\
█          █
█         ▆█
█        ▄██
█       ▁███
█       ████
█      ▇████
█     ▄█████
█    ▂██████
█    ███████
█   ████████
█  ▅████████
█ ▃█████████
█ ██████████";

assert_eq!(
    display_utils::vertical_unicode_block_bars(13,
        [1.0, 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0].iter().copied()
    ).to_string(),
    expected_output,
);