public/subjects/diamond_creation

diamond_creation

Instructions

Build the function make_diamond which takes a letter as input, and outputs it in a diamond shape.

Rules:

• The first and last row contain one 'A'.
• The given letter has to be at the widest point.
• All rows, except the first and last, have exactly two identical letters.
• All rows have as many trailing spaces as leading spaces. (This might be 0).
• The diamond is vertically and horizontally symmetric.
• The diamond width equals the height.
• The top half has the letters in ascending order. (abcd)
• The bottom half has the letters in descending order. (dcba)

Notions

• pattern syntax

Expected functions

pub fn get_diamond(c: char) -> Vec<String> {

}

Usage

Here is a program to test your function.

use diamond_creation::*;

fn main() {
    println!("{:?}", get_diamond('A'));
    println!("{:?}", get_diamond('C'));
}

And its output:

$ cargo run
["A"]
["  A  ", " B B ", "C   C", " B B ", "  A  "]
$