UUID string generation
The generated UUID string is returned in the format "e8b2a2b5-5ceb-4f75-a08b-1f1bdfdca4f1" (each alphanumeric character except hyphen is a hexadecimal digit).
Generates and returns a UUID string. This method generates a 128-bit UUID (universal unique identifier) generated based on a random bit string.
The UUID generation algorithm implemented in Kirikiri picks up environmental noise to some extent and generates a random bit string, but it is not recommended to use it for applications that require a high degree of security.
However, it is considered "very very likely not to overlap" with his other UUIDs.