using System;
using System.Text;
class Program
{
static string string_char_remove(string s, int idx) {
int len = s.Length;
StringBuilder sb = new StringBuilder(s);
sb.Remove(idx, 1);
return sb.ToString();
}
static void Main() {
string s = "c# programming";
s = string_char_remove(s, 3);
Console.Write(s);
}
}
/*
run:
c# rogramming
*/