reverse string in place

#include <string.h>

/*reverse: reverse string s in place */
void reverse(char s[])
{
  int c , i, j;
  for (i = 0, j =strlen(s) - 1; i < j; i++, j--){
       c = s[i];
       s[i] = s[j];
       s[j] = c;
  }
}