Fix: fixed memory leak

main.go

packages/curl/batch_hasher.go

packages/database/database.go

packages/datastructure/doubly_linked_list.go

packages/datastructure/lru_cache.go

packages/datastructure/lru_cache_options.go

packages/datastructure/random_map.go

packages/events/event_test.go

packages/model/meta_transaction/constants.go

packages/model/meta_transaction/meta_transaction.go

packages/model/meta_transaction/meta_transaction_test.go

packages/model/value_transaction/constants.go

packages/model/value_transaction/value_transaction.go

packages/model/value_transaction/value_transaction_test.go

packages/ternary/conversion.go

packages/ternary/conversion_test.go

packages/ternary/ternary.go

packages/transaction/transaction.go

plugins/gossip/events.go

plugins/gossip/neighbors.go