Current State

Currently, we show something along the lines of

command: declare
error: Transaction execution error = TransactionExecutionErrorData { transaction_index: 0, execution_error: "Class with hash 0x0273a597e2dbb18296c788c471af35c99315bb738be1c8c854ca83b85a75bc98 is already declared." }

Objective

Show a specific error expaling that contract was already declared instead of dumping the RPC error directly

Additional Context

The error returned by an RPC is a specif one we can safely match by its type and display better message, that is nicely formatted (see the other tool for reference).