Transfer token ownership to another account

transfer.rs

use solana_program::{
    account_info::{next_account_info, AccountInfo},
    entrypoint::ProgramResult,
    program_error::ProgramError,
    msg,
    pubkey::Pubkey,
    program_pack::{Pack, IsInitialized},
    sysvar::{rent::Rent, Sysvar},
    program::invoke
};
// inside process_init_escrow
...
let token_program = next_account_info(account_info_iter)?;
let owner_change_ix = spl_token::instruction::set_authority(
    token_program.key,
    temp_token_account.key,
    Some(&pda),
    spl_token::instruction::AuthorityType::AccountOwner,
    initializer.key,
    &[&initializer.key],
)?;

msg!("Calling the token program to transfer token account ownership...");
invoke(
    &owner_change_ix,
    &[
        temp_token_account.clone(),
        initializer.clone(),
        token_program.clone(),
    ],
)?;

Ok(())
// end of process_init_escrow