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class Solution {
 public:
     string reverseString(string s) {
         int leftP = 0;
         int rightP = s.size()-1;
         char tmpChar;
         while (leftP < rightP) {
             tmpChar = s[leftP];
             s[leftP] = s[rightP];
             s[rightP] = tmpChar;
             leftP++;
             rightP--;
         }
         return s;
     }
 };