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modify how ok and error works by:
res::internal
tores
namespace.res::Ok
instance instead of using constant (for simplicity).res::ErrMsgPtr
that was usingstd::shared_ptr<std::string>
to just usingstd::string
(for simplicity).res::Err
struct to wrap error data and force to create a newres::Err
instance instead of just passing the error message.