Dictionary Key-Value Inversion

A data transformation job reverses a lookup table to build a bidirectional key-value index for faster reverse lookups in a dimension store. Given a dictionary `inp_dict` with string keys and string values, return a new dictionary where keys and values are swapped. **Task:** Invert the dictionary so original values become keys and original keys become values. **Key Rules:** - If duplicate values exist in the input, the **last occurrence's** key wins in the output. **Constraints:** - `0 <= len(inp_dict) <= 10,000` - Keys and values are non-empty strings.