Tuple to String Conversion

Write a function `tuple_to_string(tup)` that takes a tuple of characters as input and returns a string formed by concatenating all the characters in the tuple.

#### Example Usage:
```python [main.nopy]
print(tuple_to_string(('h', 'e', 'l', 'l', 'o')))  # Output: "hello"
print(tuple_to_string(('P', 'y', 't', 'h', 'o', 'n')))  # Output: "Python"
print(tuple_to_string(('1', '2', '3')))  # Output: "123"
```

#### Constraints:
- The input tuple will only contain single-character strings.
- The function should return a string.
def tuple_to_string(tup):
    """
    Convert a tuple of characters into a string.

    Args:
    tup (tuple): A tuple containing single-character strings.

    Returns:
    str: A string formed by concatenating the characters in the tuple.
    """
    # Your code here
    pass
Beginner strings
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