refactor dynamic array: update default size definitions and improve header guard

src/test_dynamic_array.c

@@ -12,7 +12,7 @@ void tearDown() {
 
 void test_array_create_without_options(void) {
     const Array *array = array_create(NULL);
-    TEST_ASSERT_EQUAL(DEFAULT_ARRAY_SIZE, array->capacity);
+    TEST_ASSERT_EQUAL(DYNAMIC_ARRAY_DEFAULT_ARRAY_SIZE, array->capacity);
 }
 
 
@@ -157,7 +157,7 @@ void test_array_get_capacity_default(void) {
 
     const size_t capacity = array_get_capacity(array);
 
-    TEST_ASSERT_EQUAL(DEFAULT_ARRAY_SIZE, capacity);
+    TEST_ASSERT_EQUAL(DYNAMIC_ARRAY_DEFAULT_ARRAY_SIZE, capacity);
 
     array_deconstructor(&array);
 }