Update evaluate.py

./kyu_2/evaluate_mathematical_expression/evaluate.py:175:1: W293 blank line contains whitespace
    """
    Normalizing string input by checking conditions.

    :param strings: list
    :param string: str
    :param temp: str
    :return: tuple(str, str)
    """

kyu_2/evaluate_mathematical_expression/evaluate.py

@@ -172,7 +172,7 @@ def calc(string: str) -> float:
 def check_conditions(strings: list, string: str, temp: str) -> tuple[str, str]:
     """
     Normalizing string input by checking conditions.
-    
+
     :param strings: list
     :param string: str
     :param temp: str