commentFormatting: put a space between `//` and comment text (gocritic)

fmt.Errorf can be replaced with errors.New (perfsprint)

SA1019: backends.NewSimulatedBackend is deprecated: please use simulated.Backend from package github.com/ethereum/go-ethereum/ethclient/simulated instead. (staticcheck)

SA4010: this result of append is never used, except maybe in other appends (staticcheck)

require-error: for error assertions use require (testifylint)

require-error: for error assertions use require (testifylint)

require-error: for error assertions use require (testifylint)