public void ValidData()
{
DrawingTool cnv = new DrawingTool(20, 4);
string result = string.Empty;
cnv.DrawCanvas();
cnv.DrawLine(new string[] { "1", "2", "6", "2" });
cnv.DrawLine(new string[] { "6", "3", "6", "4" });
cnv.DrawRectangle(new string[] { "16", "1", "20", "3" });
cnv.FillCanvas(10, 3, "o");
Console.WriteLine(cnv.DrawArray(cnv.Canvas));
}