public static void Main()
string a = "aaaaaaaaaa\"aaa\"aaaaaaaaaaaaaa\naaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\naaaaa\"aaaaaaaaaa\"aaaaaaaaaaaaa";
string[] nova = a.Split('"');
for (int i = 0; i < nova.Length; i++)
if (i == 1 || i % 3 == 0)
StringBuilder k = new StringBuilder();
for (int v = 0; v < x; v++)
nova[i] = '"' + k.ToString() + '"';
foreach (var item in nova)
novastring += item.ToString();
Console.WriteLine(novastring);