[examples] stupid bug with copying fixed;

examples/helpers.c

@@ -79,7 +79,7 @@ static inline int __removechar(char *b, size_t chrs)
   char *c = b + chrs;
   size_t blen = strlen(c) + sizeof(char);
 
-  memcpy(b, c, blen);
+  memmove(b, c, blen);
 
   return chrs;
 }