void sortFirst() {
    string sortedFirst;
    string firstname[20];
    
    string key;
    string col1;
    string col2;
    string col3;
    
    ifstream sortByFirst;
    
    cout << "\n\n\tSORTED BY FIRST NAME ================\n\n";

    sortByFirst.open("student-file.txt");

    while(getline(sortByFirst, sortedFirst)) 
    {
        istringstream iss(sortedFirst); 
        iss >> col1 >> col2 >> col3; 
//      cout << "\t" << col2 << endl;

    for (int i = 0; i<1; i++) {
        firstname[i] = col2;
//      cout << "\n" << firstname[i];

    for (int a = 1, b = 0; a < 20; a++) {
        key = firstname[a];
        b = a-1;
        
        while (b >= 0 && firstname[b] > key) {
            firstname[b+1] = firstname[b];
            b--;
        }
        firstname[b+1] = key;
    }
    } 
    }
    
    for (int k = 1; k < 20; k++) {
        cout << "\n\t" << firstname[k];
    }

    sortByFirst.close();
    
}
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