please code in c++, by the way Boo and lean are just two animals' names

Given two strings of text, calculate their concatenation and return it as a separate string of text. The concatenation of two strings is a string that contains all of the characters in the first string, followed by all of the characters in the second. For example, the concatenation of boo and lean is boolean. (Whenever these problems refer to a 'string of text," I'm referring to a sequence of individual characters. Choose an implementation that is appropriate for the language you chose. For example, in Java, you would use a String; in C++, you might use a std::string or a char and so on.)