3.12 Example: unichr

   /*  exchr.c - unichr sample.  Find the first occurrence of a character. */ 
   #include <nunicode.h> 
   #include <assert.h> 
   void main(void) 
   { 
      punicode puni = L"banana"; 
      punicode ptr; 
      ptr = unichr(puni, ’a’);       /* Returns ptr to the first ’a’ */ 
      assert(unicmp(ptr, L"anana") == 0); 
      ptr = unichr(puni, ’Z’);       /* If not found, return NULL. */ 
      assert (ptr == NULL);             
   }