Refactor namespace prefix construction to avoid String concatenation in loop

Description

While reviewing InternalPrefixedConfig, I noticed that the namespace prefix is built using String concatenation inside a loop.

This works correctly, but repeated string concatenation can be inefficient and less readable, especially when the intent is to build a prefix string.

Proposed Improvement

Refactor the constructor to:

• Avoid String concatenation inside loops
• Use StringBuilder or a stream-based approach
• Improve readability while keeping behavior unchanged

Scope

• Internal refactor only
• No functional or behavioral changes

Question

Would it be okay if I work on this refactoring and open a Pull Request?