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Write a Python function `replace_blank` that takes in two arguments:
1. A string `input_string`.
2. A character `replacement_char`.
The function should replace all blank spaces in the `input_string` with the `replacement_char` and return the modified string.
#### Example Usage
```python [main.nopy]
replace_blank("hello world", "-")
# Output: "hello-world"
replace_blank("python programming", "*")
# Output: "python*programming"
replace_blank("replace spaces", "_")
# Output: "replace_spaces"
```def replace_blank(input_string: str, replacement_char: str) -> str:
"""
Replace all blank spaces in the input string with the specified replacement character.
Args:
input_string (str): The string to process.
replacement_char (str): The character to replace spaces with.
Returns:
str: The modified string with spaces replaced.
"""
# Replace spaces with the replacement character
pass # Replace this with the actual implementation