先用makefile编译,连接后,client发字符到server端并返回该字符串,遇到a,e,i,o,u则加*号,如*a,收到fin字符串则结束客户端及服务器端程序.实现echo功能-First makefile compile, connected, client fat client characters into server and return the string encountered in a, e, i, o, u will add an asterisk, such as*