Rust Mutable vec in a Struct

Hello!

I'm trying to learn rust but I cant seem to wrap my head around this problem, and why i'm getting this error.|

28 | fn update\_cell(&mut self, cell: usize, value: &str) {

| --------- - let's call the lifetime of this reference \'1\\

| |

| has type \&mut Board<'2>\\

29 | self.squares\[cell\] = value;

| \^\^\^\^\^\^\^\^\^\^\^\^\^\^\^\^\^\^\^\^\^\^\^\^\^\^ assignment requires that \'1\\ must outlive \'2\\

Below is my program, i removed some functions that works fine.

struct Board<'a> {
    squares: Vec<&'a str>,
}

impl Board<'_> {

    fn update_cell(&mut self, cell: usize, value: &str) {
        self.squares[cell] = value;
    }
}
fn main() {
    let mut board = Board {
        squares: vec![" ", " ", " ", " ", " ", " ", " ", " ", " "],
    };

    board.update_cell(0, "X");
    board.draw_board();
}

I'm trying real hard to get into rust and i know it's good to run into these things at compile time.

Is it because i already have a mutable reference to board in the main scope?
How would i then solve this issue?

Could some helpful soul please guide me?