reverse the string best optimal solution

 Reverse a String

 you are given a string s. you need to reverse the string s .

input : aayush

output : hsuyaa

Your Task:

You only need to complete the function reverseWord() that takes s as parameter and returns the reversed string.

Expected Time Complexity: O(|S|).
Expected Auxiliary Space: O(1).

Constraints:
1 <= |s| <= 10000

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solution: 

void swap(int &a , int &b)

{

    int temp ;

    temp = a ; 

    a = b ;

    b = temp;

}

string reverseWord(string str){

    

  int len = str.length();

  int x = len-1;

  int i =0;

  while(i < len/2)

  { 

      swap(str[i] , str[x]);

      i++;

      x--;

      

  }

  return str;

}

time complexity : O(n/2)