This example shows a Solidity smart contract system for managing customer KYC (Know Your Customer) data across banks, with structs defining customers, banks, and KYC requests, plus mappings for storage and an event for tracking new requests. The code uses the `KYCValidations` library with custom modifiers `isValidCustomerUserName` and `isValidCustomerData` to enforce non-empty input validation, and imports it via `import './KYCValidations.sol'`. The `KYCPhase2` contract adds requests through the `addRequest` function, which emits a `KYCRequestAdded` event but does not store the request, as the function returns `false` without modifying state. The implementation relies on Solidity’s mapping data structures and the `msg.sender` address to capture the requesting bank.