C# practice, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Program prg = new Program();
            
            /*Given a string with fixed value = “MYR 1045.54”, write a function that can remove the currency at the front and return 1045.54 in string format*/
            string Currency_Remove = prg.Question_One("MYR 1045.54");
            Console.WriteLine(Currency_Remove);
            
            /*Given a string with fixed value = “MYR 1045.54", write a function can return ” RM 1045.00" in string format*/
            string Currency_Value_Replace = prg.Question_Two("MYR 1045.54");
            Console.WriteLine(Currency_Value_Replace); 
            
            /* Given a string with any value, for example, “MYR 1045.54”, write a function can return double value with “MYR 1045.00", with the function can receive any amount of string value with MYR currency is fixed. */
            string Price_Return_Double = prg.Question_Three("1045.54");
            Console.WriteLine("MYR {0}", Price_Return_Double);
            
            /* Given mobile phone number in string = “013 4471042”, write a function that will split the string into two string, first is the country code, second is the phone number. For example, this string will be split into string A = “013", string B = “4471042”*/
            
            string phone_number = "013 4471042";
            prg.Question_Four(phone_number);
          
            
            
        }
        
        public string Question_One(string Price)
        {
            string Currency_Remove;
            Currency_Remove = Price.Remove(0,4);
            return Currency_Remove;
        }
        
        public string Question_Two(string Price2)
        {
            string Currency_Value_Replace;
            Currency_Value_Replace = Price2.Replace("MYR", "RM").Replace(".54", ".00");
            return Currency_Value_Replace;  
        }
        
        public string Question_Three(string Price3)
        {
            string Price_Return_Double;
            Price_Return_Double = Convert.ToString(Double.Parse(Price3)).Replace("54","00");
            return Price_Return_Double;
        }
        
        public string Question_Four(string phone_number)
        {
            int count = 1;
            Char[] separator = { ' ' };
            String[] phonenumList = phone_number.Split(separator, StringSplitOptions.RemoveEmptyEntries);
            foreach(String p in phonenumList)
            {

Console.WriteLine("String " + count + ":" + p);
                count++;
            }
            return null;
        }

}
}

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Compilation time: 1.02 sec, absolute running time: 0.99 sec, cpu time: 0.79 sec, memory peak: 40 Mb, absolute service time: 2,1 sec