refactoring: added new line

src/main/py/read_math_function.py

@@ -122,6 +122,7 @@ def sum_of_simplified_exponential_functions(type, function):
     summands = function.split('+')
     return simplify_exponential_function('e', summands)
 
+
 def difference_of_simplified_exponential_functions(type, function):
     if type !="de":
         return False