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;
}