Update and rename Backtracking/combinational_sum.py to General Questions/combinational_sum.py

fixed errors and moved to General Questions folder

Author: bhagyashree-06

Backtracking/combinational_sum.py renamed to General Questions/combinational_sum.py

@@ -43,7 +43,7 @@ def combinationSum(self, A, B):
         # if the target sum is less than 2 or the lis A is empty,
         # then retirn an empty list
         if B<2 or len(A)==0:
-            return [[]]
+            return []
 
 
         result=[]