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Look at the original algorithm. Every word gets inverted twice (tmpCpy becomes a backwards word, which is then inverted again when copied to reversedString). That will never be an optimal solution...

You could make it even simpler:



string[] words = input.Split(' ');
Array.Reverse(words);
string result = string.Join(" ", words);


Anyhow, to the original poster, it's fine to do things...