本次练习的主题是"挖矿"，由你来编写"挖矿client"，从老师编写的"矿池server"下载计算任务，按照要求编写你的"挖矿"逻辑，并将计算得到的"区块"提交给"矿池server"，验证成功的话你就通过了本次"考试"。
老师作为"矿池主"，对各位"矿工们"的劳动贡献一清二楚，所以大家不需要截图给老师，只要自己挖到矿就自然会通过"考试"了。
简单了解区块链挖矿的原理：《阮一峰-区块链入门教程》
你需要阅读整个代码结构，然后解决3个作业，最终才能挖到矿：
cd course6/client
go run main.go -address 服务器地址 -content 你的名字
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