给定一篇文章，将其中所有的"it's"替换为"it is"并输出处理后的文章。
一篇包含多个“it's”的文章，例如：“It's been a long day, but it's worth it.”
"It's been a long day, but it's worth it" would become "It is been a long day, but it is worth it" after replacing all instances of "it's".