Is it necessary to allocate a separate structure for each running goroutine?

No, it is not necessary to allocate a separate structure for each goroutine. Goroutines are lightweight threads that can be launched without binding to a specific data structure. However, if a goroutine needs to work with a specific set of data or state, it is convenient to encapsulate this data in a structure to pass it to the goroutine. This improves readability and state management, but it is not a mandatory requirement.