using static System.Console;
using static System.Convert;
using System.Text;
 
public class Test {
	public static void Main() {
		WriteLine(WrapString("0123456789012345678901234567890123456789", 10));
		WriteLine(WrapString("01234567890123456", 10));
		WriteLine(WrapString("012345", 10));
	}
 
	static string WrapString(string text, int len) {
		if (text.Length <= len) return text;
		var sb = new StringBuilder(text.Length + text.Length / len * 2);
		var i = 0;
		for (; i < text.Length / 10; i++) {
			sb.Append(text[(i * 10)..(i * 10 + 10)]);
			sb.Append("\r\n");
		}
		if (text.Length / 10 != ToSingle(text.Length) / 10) {
			sb.Append(text[(i * 10)..]);
			sb.Append("\r\n");
	} else sb.Remove(sb.Length - 2, 2);
		return sb.ToString();
	}
}
 
//https://pt.stackoverflow.com/q/228864/101

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