C#

public static string wordReverse(string s) {
    string[] sa=s.Split(" ");
    Array.Reverse(sa);
    return string.Join(" ",sa);

public static string wordReverse(string s) {
    string[] sa=s.SubString(0,s.Length-1).Split(" ");
    Array.Reverse(sa);
    return string.Join(" ",sa)+s.SubString(s.Length-1);

Point[] pts = new Point [100];

string Swap(string input)
{
   return input.Split(' ').Reverse().Aggregate((first, second) => first + " " + second);
}

string Swap(string input)
{
    string[] words = input.Split(' ');
    IEnumerable<string> reversedWords = words.Reverse();

    // Insert spaces in between the words and combine them.
    return reversedWords.Aggregate((first, second) => first + " " + second);     
}

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