Fix "method_complexity" issue in kyu_2/evaluate_mathematical_expression/evaluate.py

[ikostan]

Function check_conditions has a Cognitive Complexity of 20 (exceeds 5 allowed). Consider refactoring.

https://codeclimate.com/github/iKostanOrg/codewars/kyu_2/evaluate_mathematical_expression/evaluate.py#issue_6721b1256578ac0001000401

[ikostan]

Function check_conditions has a Cognitive Complexity of 20 (exceeds 5 allowed). Consider refactoring. New
def check_conditions(strings: list, string: str, temp: str) -> tuple[str, str]:
"""
Normalizing string input by checking conditions
:param strings: list
:param string: str
Severity: MinorFound in kyu_2/evaluate_mathematical_expression/evaluate.py - About 2 hrs to fix

[ikostan]

Cognitive Complexity

Cognitive Complexity is a measure of how difficult a unit of code is to intuitively understand. Unlike Cyclomatic Complexity, which determines how difficult your code will be to test, Cognitive Complexity tells you how difficult your code will be to read and comprehend.

A method's cognitive complexity is based on a few simple rules:

1. Code is not considered more complex when it uses shorthand that the language provides for collapsing multiple statements into one
2. Code is considered more complex for each "break in the linear flow of the code"
3. Code is considered more complex when "flow breaking structures are nested"

Further reading
Cognitive Complexity docs
Cognitive Complexity: A new way of measuring understandability