How to read the rest of a sequence from new line and without the space? c++

So now looking at line 2, Cow- DNA Sequence; this continues on line 13 and 24 and ... I want to get this long sequence for each sequences ignoring the white space and new line in between.

This is the format of the file: 1

This is the code, which reads the first 10 sequences only

ifstream file ("txt");
string line;
vector <string> vec;
stringstream s;
string name;

string strip(string & s)
{
    size_t b = s.find_first_not_of(' ');
    size_t e = s.find_last_not_of(' ');
    if (b == string::npos) {
        return "";
    } else {
        return s.substr(b, e - b + 1);
    }
}

void getSequence(){
    int i;
    int row;
    int col;
    if (file.is_open()) 
    {
        file >> row >> col;
        for (i = 0; i < row; i++) {
            vec.push_back("");
        }
        i = 0;
        while (getline(file, line)) 
        {
            file >> name;
            if (line == " ") 
            {
                continue;
            }

            vec[i % row] += strip(line);
            i++;
        }
    } 
    else {
        cerr << "Error: file did not open!" << endl;
    }
    for (const string & v : vec) {
        cout << v << endl;
    }
}

Thank you in advance for your help.