added test for calculating string without pow as well as corresponding functionality

src/main/py/read_math_function.py

@@ -11,3 +11,10 @@ def is_string(value):
 def is_allowed_string(type, value):
     allowed = "+-*/()^"
     return all(character.isdigit() or character in allowed for character in value)
+
+def calculate_string(string):
+    try:
+        result = eval(string)
+        return result
+    except Exception as e:
+        return f"Fehler bei der Berechnung: {str(e)}"

src/test/py/test_read_math_function.py

@@ -15,6 +15,8 @@ class read_function(unittest.TestCase):
         self.assertEqual(is_allowed_string("c", "42^(2)+1-3*4/3"), True)
     def test_constant_isallowed_string_false(self):
         self.assertEqual(is_allowed_string("c", "42^(2)+1-3*4/3x"), False)
+    def test_constant_calculate_without_pow(self):
+        self.assertEqual(calculate_string("42+1-3*4/3"), 39)
 
 if __name__ == '__main__':
     unittest.main()