remove redundant declaration

Co-authored-by: realstealthninja <[email protected]>

Author: mjk22071998

greedy_algorithms/digit_separation.cpp

@@ -132,7 +132,7 @@ static void tests(){
     number = -987654321012345;
     expectedReverse = {5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
     expectedForward = {9, 8, 7, 6, 5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5};
-    std::vector<std::int64_t> reverseOrder = ds.digitSeparationReverseOrder(number);
+    reverseOrder = ds.digitSeparationReverseOrder(number);
     assert(reverseOrder == expectedReverse);
     reverseOrder = ds.digitSeparationReverseOrder(number);
     assert(reverseOrder == expectedReverse);