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 = 0;
    j = strlen(s) - 1;
    while(i < j){
        temp = s[i];
        s[i] = s[j];
        s[j] = temp;
        i++;
        j--;
    }
    return s;
}