feat: update structure

cs2106/labs/lab2/part1/autograder/ref/utils.c

@@ -0,0 +1,10 @@
+#include "utils.h"
+
+int sum(int sum_array[], int n) {
+    int i, res = 0;
+
+    for(i=0; i<n; i++)
+        res += sum_array[i];
+
+    return res;
+}