Tic Tac Toe function for plotting player mark in the board

main.rs

fn plot_player(player : &String, board : &mut Vec<String>, index : &usize) -> (bool,bool) {
    let mut is_won = false;
    let mut is_valid = true;
    if board[index-1] != String::from("X") && board[index-1] != String::from("O") && !is_won {
        board[index-1] = player.to_string();
        is_won = check_win(player.to_string(),board.to_vec());
    } else {
        is_valid = false;
    }
    return (is_valid,is_won);
}