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string s = "i am a Student";
s = string.Join(" ", s.Split(' ').Select(x =>new string( x.Reverse().ToArray())));
string a = "i am a Student";
Console.WriteLine(a.Split(' ').Aggregate((s, n) => s + " " + new string(n.Reverse().ToArray())));
string s = "i am a Student";
s = string.Join(" ", s.Split(' ').Select(x => x.Reverse()));