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Check All Characters Same

Write a Python function `all_characters_same(s)` that checks whether all characters in a given string `s` are the same. The function should return `True` if all characters are identical, and `False` otherwise.

#### Example Usage
```python [main.nopy]
all_characters_same("aaa")  # Returns: True
all_characters_same("abc")  # Returns: False
all_characters_same("")     # Returns: True (empty string is considered to have all identical characters)
```
def all_characters_same(s):
    """
    Check if all characters in the string are the same.

    Args:
        s (str): The input string.

    Returns:
        bool: True if all characters are the same, False otherwise.
    """
    # Placeholder for the solution
    pass