编辑一篇文章，并在其中修复拼写错误、语法错误和标点符号。


以下是一篇包含错误的文章，需要进行编辑：
“I havent seen you since last week,” he said “What have you been up too” I replied, “Not much just working a lot.”
“I haven't seen you since last week,” he said. “What have you been up to?” I replied, “Not much, just working a lot.”