public class TriangleUtilities {
    public static String getRow(int numberOfStars) {
        StringBuilder row = new StringBuilder();

        for(int i=1; i <= numberOfStars; i++){

            row.append('*');

        }
        return row.toString();
    }

    public static String getTriangle(int numberOfRows) {
        StringBuilder stars = new StringBuilder();
        for(int i=1; i<= numberOfRows; i++){
            String triangle = getRow(i);
            stars.append(triangle +"\n");

        }
        return stars.toString();
    }

    public static String getSmallTriangle() {
        return getTriangle(4);
    }

    public static String getLargeTriangle() {
        return getTriangle(9);
    }
}