An Anchor poll program with create and vote instructions

anchor_poll.rs

use anchor_lang::prelude::*;

declare_id!("Fg6PaFpoGXkYsidMpWTK6W2BeZ7FEfcYkg476zPFsLnS");

#[program]
pub mod anchor_poll {
    use super::*; 

    pub fn create_poll(ctx: Context<CreatePoll>, question: String, options: Vec<String>) -> Result<()> {
        let poll = &mut ctx.accounts.poll;
        poll.question = question;
        poll.options = options.into_iter().map(|option| (option, 0)).collect();
        poll.creator = *ctx.accounts.user.key;
        Ok(())
    }

    pub fn vote(ctx: Context<Vote>, option_index: u8) -> Result<()> {
        let poll = &mut ctx.accounts.poll;
        if let Some((_, count)) = poll.options.get_mut(option_index as usize) {
            *count += 1;
        } else {
            return err!(PollError::InvalidOption);
        }
        Ok(())
    }
}

#[account]
pub struct Poll {
    pub question: String,
    pub options: Vec<(String, u64)>,
    pub creator: Pubkey,
}

#[derive(Accounts)]
pub struct CreatePoll<'info> {
    #[account(init, payer = user, space = 8 + 32 + 4 + 256 + 4 + 256)] // Adjust space as needed
    pub poll: Account<'info, Poll>,
    #[account(mut)]
    pub user: Signer<'info>,
    pub system_program: Program<'info, System>,
}

#[derive(Accounts)]
pub struct Vote<'info> {
    #[account(mut)]
    pub poll: Account<'info, Poll>,
    pub user: Signer<'info>,
}

#[error_code]
pub enum PollError {
    #[msg("Invalid option selected.")]
    InvalidOption,
}