#Golang

Design a Logging System that can handle high throughput and low latency requirements. Discuss the components, flow, high-level design (HLD), and possible bottlenecks in your design.

Design a REST API for a given application. Detail the endpoints, data flow, and error handling you would implement. Additionally, construct the high-level design (HLD) outlines for the API.

Explain how to flatten a linked list, which is a list of linked lists, into a single linked list. Discuss your approach, challenges faced, and how you would implement this in your code.