Given a string on one line and an integer number on a second line, add a copy of the last number of characters of the string to the string's end. Then, output the result. Ex: If the input is: Fuzzy bear 4 the output is: Fuzzy bearbear Note: Using a pre-defined string function, the solution can be just one line of code. #include #include using namespace std; int main() {    string strVar;    int substrLen;    getline(cin, strVar);    cin >> substrLen;    /* Your code goes here */    cout << strVar << endl;        return 0; }

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A:

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Methods of StringBuilder class

The StringBuilder class can be used to create mutable strings. The methods defined in the StringBuilder class are widely used to manipulate and concatenate strings. It is a non-synchronized class which has public methods that can be accessed by multiple threads. It is not thread-safe.