[Snippet rust]
```rust
fn get_email_optional(&self) -> Option<pii::Email>;
```
Path: hyperswitch/crates/hyperswitch_connectors/src/connectors/shift4/transformers.rs :: get_email_optional (function, crate=hyperswitch_connectors)

Negatives:
- hyperswitch/crates/euclid_macros/src/inner/knowledge.rs :: compile_atom
- hyperswitch/crates/hyperswitch_connectors/src/connectors/forte.rs :: get_content_type
- hyperswitch/crates/hyperswitch_connectors/src/connectors/cybersource.rs :: get_request_body
- hyperswitch/crates/router/src/core/payments.rs :: is_payment_flow_allowed_for_connector
- hyperswitch/crates/hyperswitch_connectors/src/connectors/calida/transformers.rs :: try_from