Dictionary Merger

Problem Statement

Merge and manipulate dictionaries.

Python dictionaries support:

Write a function merge_dicts(dict1, dict2) that merges two dictionaries.

If a key exists in both, sum the values (if numeric) or concatenate (if strings)
Keep unique keys from both dictionaries

Return the merged dictionary.

Input:

dict1 = {"a": 1, "b": 2, "c": "hello"}, dict2 = {"b": 3, "d": 4, "c": " world"}

Output:

{'a': 1, 'b': 5, 'c': 'hello world', 'd': 4}

Reasoning:

'a' only in dict1, 'b' in both (2+3=5), 'c' in both (concat), 'd' only in dict2