refactoring: removed unnecessary description

src/arithmeticMultiplication_Double.c

@@ -5,7 +5,7 @@
 double* multiplication_double(double a, double b) {
     double* result = (double*)malloc(sizeof(double));
     if (result == NULL) {
-        return NULL; // Handle memory allocation failure
+        return NULL;
     }
     *result = a * b; // we multiply a times b and the result gets saved in *result
     return result;