code: @NonNull
      public EmailIntentBuilder cc(@NonNull Collection<String> cc) {
          checkNotNull(cc);
          for (String email : cc) {
              checkEmail(email);
          }
          this.cc.addAll(cc);
  
          return this;
      }
docs: Add an email address to be used in the "cc" field.
  
  @param cc
  the email addresses to add
  
  @return This {@code EmailIntentBuilder} for method chaining