Function contract_id 

pub fn contract_id() -> Result<AccountId>

Returns this contract’s account ID.

Useful for:

• Self-referential operations
• Checking if caller is this contract (for callbacks)
• Logging contract address

Returns

The 32-byte account ID of the current contract.

Example

let my_address = context::contract_id()?;
log::emit_event(&ContractDeployed { address: my_address })?;