Generates a struct which allow you to call contract functions. The output
struct will have the same name as the file, and have individual async
methods for each contract function with parameters and output corresponding
to the ABI.
Securely stores a secret key in memory that is zeroized on drop. Care is
taken so that when this struct is constructed or moved that additional
copies of the secret are not made in memory or disk.
https://github.com/veorq/cryptocoding#clean-memory-of-secret-data