refactoring: changed variables for long method similar to integer method

src/arithmeticDivision.c

@@ -16,11 +16,11 @@ int* division_integer(int dividend, int divisor) {
     return result;
 }
 
-long* division_long(long num1, long num2) {
-    if(num2 == 0) {
+long* division_long(long dividend, long divisor) {
+    if(divisor == 0) {
         return NULL;
     }
     long* result = malloc(sizeof(long));
-    *result = num1 / num2;
+    *result = dividend / divisor;
     return result;
 }