public static String Reshape(int n, String str)
var strs = str.Trim().Split(null);
var strBuilder = new StringBuilder(strs.Length);
for(int i = 0; i< strs.Length; i++)
strBuilder.Append(strs[i]);
modifStr = strBuilder.ToString();
int nbChar = modifStr.Length;
Console.WriteLine(nbChar);
int newStrLength = modifStr.Length;
Console.WriteLine(newStrLength);
for(int i = n; i <= newStrLength; i+=n)
modifStr = modifStr.Insert(i, whiteSpace);
public static void Main()
string str = "ezrer ezet er e erztzt";
Console.WriteLine("chaine : " + str);
Console.WriteLine("chaine modifier : " + str);