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The concatenation operator allowed concatenating together vectors to form a larger vector. But sometimes you want the same thing concatenated together many times, and it is still tedious to do something like assign a = {b,b,b,b,b,b};. The replication operator allows repeating a vector and concatenating them together: 连接运算符可以将多个向量连接起来以形成一个更大的向量。但有时你需要将同一个内容重复连接多次，像编写 a = {b,b,b,b,b,b}; 这样的语句仍然很繁琐。复制运算符则可以重复一个向量并将它们连接在一起：
Build a circuit that sign-extends an 8-bit number to 32 bits. This requires a concatenation of 24 copies of the sign bit (i.e., replicate bit[7] 24 times) followed by the 8-bit number itself. 构建一个将8位数字符号扩展为32位的电路。这需要将24个符号位（即将位[7]复制24次）与8位数字本身进行拼接。
Module Declaration
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拼接符号的多种用法 
Solution
==注意一下这里的{}是怎么嵌套的==
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