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using System;
public static class StringExtension {
public static void PrintToConsole(this string text) {
Console.WriteLine("Xin chào: {0}", text);
}
public static void EatWith(this string text, string name) {
Console.WriteLine("Xin chào: {0}, bạn đang ăn với {1}", text, name);
}
}
class HelloWorld {
static void Main() {
var myName = "CSharp Tourist";
myName.PrintToConsole();
myName.EatWith("Đông");
}
}
