You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: entrypoint.rs
    path of file: ./repos/darkfi/src/sdk/src
    
    the code of the file until where you have to start completion: /* This file is part of DarkFi (https://dark.fi)
 *
 * Copyright (C) 2020-2024 Dyne.org foundation
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published
    
pub unsafe fn deserialize<'a>(input: *mut u8) -> (ContractId, &'a [u8]) {
    let mut offset: usize = 0;

    let contract_id_len = 32;
    let contract_id_slice = { from_raw_parts(input.add(offset), contract_id_len) };
    offset += contract_id_len;

    let instruction_data_len = *(input.add(offset) as *const u64) as usize;
    offset += size_of::<u64>();
    let instruction_data = { from_raw_parts(input.add(offset), instruction_data_len) };

    let contract_id = ContractId::from_bytes(contract_id_slice.try_into().unwrap());
    // We unwrap here because if this panics, something's wrong in the runtime:
    let contract_id = contract_id.unwrap();

    (contract_id, instruction_data)
}