15>addBorder

Given a rectangular matrix of characters, add a border of asterisks(*) to it. Example For picture = ["abc",            "ded"] the output should be addBorder(picture) = ["*****",                          "*abc*",                          "*ded*",                          "*****"]

code>>

std::vector<std::string> addBorder(std::vector<std::string> picture) {

    for (int i = 0; i < picture.size(); i++)

{

picture[i] = "*" + picture[i] + "*";

}

picture.insert(picture.begin(), std::string(picture[0].size(), '*'));

picture.insert(picture.end(), std::string(picture[0].size(), '*'));

return picture;

}