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First Repeated Character

Write a Python function `first_repeated_char` that takes a string as input and returns the first character that is repeated in the string. If no character is repeated, return `None`.

#### Example Usage
```python [main.nopy]
print(first_repeated_char("abcabc"))  # Output: "a"
print(first_repeated_char("abc"))     # Output: None
print(first_repeated_char("123123")) # Output: "1"
```
def first_repeated_char(input_string):
    """
    Find the first repeated character in the given string.

    Args:
        input_string (str): The string to search for repeated characters.

    Returns:
        str or None: The first repeated character, or None if no character is repeated.
    """
    # Placeholder for the solution
    pass
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