[REFACTOR] [Hacker Rank]: Warmup: Simple Array Sum. Static check issue solved.

->

src/lib/exercises/src/hackerrank/warmup/simple_array_sum.cpp:20:41: performance: Function parameter 'ar' should be passed by const reference. [passedByValue]
    int simpleArraySum(std::vector<int> ar) {

Author: Gonzalo Diaz

src/lib/exercises/include/exercises/hackerrank/warmup/simple_array_sum.hpp

@@ -4,5 +4,5 @@
 #pragma once
 
 namespace hackerrank::warmup {
-    int simpleArraySum(std::vector<int> ar);
+    int simpleArraySum(const std::vector<int>& ar);
 }

src/lib/exercises/src/hackerrank/warmup/simple_array_sum.cpp

@@ -17,7 +17,7 @@ vector<string> split(const string &);
 
 namespace hackerrank::warmup {
 
-    int simpleArraySum(std::vector<int> ar) {
+    int simpleArraySum(const std::vector<int>& ar) {
         int accum = 0;
 
         for(const int i : ar)  {