solana-program-examples/tokens/nft-minter/native/program/src/processor.rs

use {
    borsh::{ 
        BorshDeserialize, 
        BorshSerialize, 
    },
    solana_program::{
        account_info::AccountInfo, 
        entrypoint::ProgramResult, 
        pubkey::Pubkey,
    },
};

use crate::instructions::{ 
    create::{
        CreateTokenArgs,
        create_token,
    }, 
    mint::mint_to,
};


#[derive(BorshSerialize, BorshDeserialize, Debug)]
enum SplMinterIntstruction {
    Create(CreateTokenArgs),
    Mint,
}


pub fn process_instruction(
    _program_id: &Pubkey,
    accounts: &[AccountInfo],
    instruction_data: &[u8],
) -> ProgramResult {

    let instruction = SplMinterIntstruction::try_from_slice(instruction_data)?;

    match instruction {
        SplMinterIntstruction::Create(args) => create_token(accounts, args),
        SplMinterIntstruction::Mint => mint_to(accounts),
    }
}