refactoring: simplified by removing unnecessary variable

src/main/py/read_math_function.py

@@ -53,8 +53,7 @@ def simplify_easy_math_function(type, function):
     if is_string(function) is False or is_allowed_string("c", function) is True:
         return simplify_constant("c", function)
     extracted_function = extract_constant(function)
-    simplified_constant = simplify_constant("c", extracted_function[0])
-    extracted_function[0] = simplified_constant
+    extracted_function[0] = simplify_constant("c", extracted_function[0])
     return extracted_function