#include <ctype.h>

#ifndef tolower
#define      tolower(C)      (((C) >= 'A' && (C) <= 'Z')? (C) - 'A' + 'a': (C))
#endif

void toLowerString(char *s)
{
  char c;
  while(c = *s, c) {
    *s++ = tolower(c);
  }
}