Reverse String

Write a function that takes a string as input and returns the string reversed.

Example:
Given s = "hello", return "olleh".

 char* reverseString(char* s) {
     int i;
     int j;
     char temp;
     i = ;
     j = strlen(s) - ;
     while(i < j){
         temp = s[i];
         s[i] = s[j];
         s[j] = temp;
         i++;
         j--;
     }
     return s;
 }