.
public static string MetniBelliBirKarakterdenBolVeAltAltaYazdir(string metin, char krk, string karakterEklensinMi = "1")
{
string[] dizi = metin.Split(krk);
List<string> l = new List<string>();
l.AddRange(metin.Split(krk));
StringBuilder sbd = new StringBuilder();
for (int i = 0; i < l.Capacity; i++)
{
sbd.AppendLine(l[i] + (karakterEklensinMi == "1" ? krk.ToString() : ""));
}
return sbd.ToString().Trim('\n').Trim('\r');
}