flagon-io/hello

Summary

The greeting function now properly handles empty and whitespace-only names:

• Empty strings (e.g., "") now greet "world" instead of printing Hello, !
• Whitespace-only strings (e.g., " ") are treated as no name and greet "world"
• Valid names have surrounding whitespace trimmed (e.g., " Ada " greets as "Ada")

Added three tests to verify this behavior. All tests pass with cargo test.

Handles both cases and the tests cover them.