char s1[MAX_SIZE] = {"hello, world!"};
char *chPtr;chPtr = strchr1(s1,ch);
if (chPtr)
      printf("%c found at position %s\n", ch, chPtr);

char  *strchr1 (char *s, char c)

{ /*return a pointer of c in s

  This version is case sensitive

  Exercise 5 */

   int i;

   for (i = 0; i < strlen(s); i++)

      if (c == s[i]) return &s[i];

	  return NULL;

}