Function cetkaik_yhuap_move_candidates::absolute::distance

pub fn distance(a: Coord, b: Coord) -> i32

Calculates the distance between two points. The distance is defined as the larger of the difference between either the x or y coordinates. ／2点間の距離（x座標の差およびy座標の差のうち小さくない方）を計算する。

Examples:

use cetkaik_core::absolute::{distance, Coord};
use cetkaik_core::absolute::Row::*;
use cetkaik_core::absolute::Column::*;

assert_eq!(2, distance(Coord(A, K), Coord(I, N)));
assert_eq!(2, distance(Coord(I, K), Coord(I, N)));

// The standard cetkaik does not care about knight's moves, but is tested for the sake of consistency.
assert_eq!(2, distance(Coord(A, K), Coord(E, N)));