check connect four winner

1_connect_four_winner.sh

#!/usr/bin/env bash

declare -A board
for ((i=1; i<=7; i++)); do
    for ((j=1; j<=6; j++)); do
        board[$i,$j]=' '
    done
done

check_winner() {
    local player=$1
    local col=$2
    local row=$3
    local dir
    for dir in -1,0 0,-1 -1,-1 -1,1; do
        local dcol=${dir%,*}
        local drow=${dir#*,}
        local count=1
        for ((i=1; i<4; i++)); do
            if [[ ${board[$((col+i*dcol)),$((row+i*drow))]} == $player ]]; then
                ((count++))
            else
                break
            fi
        done
        for ((i=1; i<4; i++)); do
            if [[ ${board[$((col-i*dcol)),$((row-i*drow))]} == $player ]]; then
                ((count++))
            else
                break
            fi
        done
        if ((count >= 4)); then
            echo $player
            exit
        fi
    done
}

while read -r player col row; do
    board[$col,$row]=$player
    check_winner $player $col $row
done

for ((i=1; i<=7; i++)); do
    for ((j=1; j<=6; j++)); do
        if [[ ${board[$i,$j]} == ' ' ]]; then
            echo "P"
            exit
        fi
    done
done

echo "D"

2_connect_four_winner.rs

pub fn connect_four_winner(board: Vec<Vec<char>>, last_move: (usize, usize)) -> String {
    let (row, col) = last_move;
    let player = board[row][col];
    let directions = vec![
        (0, 1),  // right
        (1, 0),  // down
        (1, 1),  // down-right
        (1, -1), // down-left
    ];

    for &(dr, dc) in &directions {
        let mut count = 1;
        for i in 1..4 {
            let new_row = row as i32 + dr * i;
            let new_col = col as i32 + dc * i;
            if new_row < 0 || new_row >= 6 || new_col < 0 || new_col >= 7 {
                break;
            }
            if board[new_row as usize][new_col as usize] == player {
                count += 1;
            } else {
                break;
            }
        }
        for i in 1..4 {
            let new_row = row as i32 - dr * i;
            let new_col = col as i32 - dc * i;
            if new_row < 0 || new_row >= 6 || new_col < 0 || new_col >= 7 {
                break;
            }
            if board[new_row as usize][new_col as usize] == player {
                count += 1;
            } else {
                break;
            }
        }
        if count >= 4 {
            return player.to_string();
        }
    }

    for row in &board {
        for &cell in row {
            if cell == '0' {
                return "Pending".to_string();
            }
        }
    }

    "Draw".to_string()
}