完成FunnyString类的基本功能，重载＋，－，*，=, +=, -=, <<, >>运算符-FunnyString class to complete the basic functions of overloaded+,-,*,=,+ =,-=, " " , " " operator

该程序实现对字符串的几种操作，从而对字符串有更深入的了解-The program finish several operations of the string, and thus a deeper understanding of string