C++设计字符串类1) 能够用 “+” 来处理两个字符串的相加；2) 具有在一个字符串中搜索一个字符的功能；3) 具有在一个字符串中搜索另一个字符串的功能；4) 实现去除字符串最前面和最后的空格的功能；5) 编写一个main()函数，测试你的字符串类的各种功能。-C++ design string class 1) can use " +"　to deal with the addition of two strings　2) has a function to search for a character in a string　3) has another string in a string search function　4) implementation remove string foremost and last spaces of functions　5) the preparation of a main () function to test various functions of your string class.