Function snapps_txn_reference_impl::update_logic::apply_token_symbol_update

pub fn apply_token_symbol_update<'a>(
    snapp_account: SnappAccount<'a>, 
    update: &PartyUpdate<'a>
) -> SnappAccount<'a>

Update the token_symbol field of account::SnappAccount with the new value from the party::PartyUpdate.

Using set_or_keep:

snapp_account.token_symbol = set_or_keep(snapp_account.token_symbol, update.token_symbol)