static constexpr int64_t ram_gift_bytes = 1400;
1. <eosio.system>
2. static constexpr
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3. Function buyram
3.1. inside function buyram and add update_ram_supply()
3.2. N(eosio.ram), N(active)
3.3. set_resource_limits(res_itr->ram_bytes)
ram_gift_bytes
4. Function sellram
4.1 changebw(from, receiver, stake_net_delta, stake_cpu_delta, bool transfer)










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