C# 按照單詞反轉字符串之方法

using System;
public class reverse
{
public static void swap(string[] array, ref int istart, ref int iend)
{
string[] ch = new string[1] ;
while (istart < iend)
{
ch[0] = array[istart];
array[istart] = array[iend];
array[iend] = ch[0];
istart++;
iend--;
}
}

public static string rever(string array)
{
int len=array.Length;
string [] newstr=new string [len];
for(int s=0;s<len;s++)
{
newstr[s]=array[len-1-s].ToString();
}

int istart=0,iend=0,i;
for(i=0;i<len;i++)
{
if (newstr[i] == " ")
{
iend = i - 1;
if (istart < iend)
{
swap(newstr,ref istart,ref iend);
istart = i + 1;
}
}
else if (newstr[i] == "!" | newstr[i] == "," | newstr[i] == ".")
{
istart=i+1;
}
}
iend=len-1;
if(istart<iend)
{
swap(newstr,ref istart,ref iend);
}

array="";
for(int s=0;s<len;s++)
{
array+=newstr[s];
}
return array;
}
public static void Main()
{
string iarray = "siemens like movie!! me too.";
string reversestr = rever(iarray);
Console.WriteLine(reversestr);
}

}