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Count Characters in String

Write a Python function `count_characters` that takes a single string as input and returns the total number of characters in the string.

#### Example Usage
```python [main.nopy]
print(count_characters("hello"))  # Output: 5
print(count_characters("Python"))  # Output: 6
print(count_characters(""))  # Output: 0
```

#### Requirements
- The function should handle empty strings and return `0` for them.
- The function should count all characters, including spaces and special characters.
def count_characters(input_string):
    """
    Count the total number of characters in the given string.

    Args:
        input_string (str): The string to count characters in.

    Returns:
        int: The total number of characters in the string.
    """
    # Initialize a counter variable
    total_characters = 0

    # Iterate through each character in the string
    # Increment the counter for each character

    # Return the total count
    return total_characters
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