() send_grams(slice address, int amount) impure {
  cell msg = begin_cell()
    .store_uint (0x18, 6) ;; bounce
    .store_slice(address) ;; 267 bit address
    .store_grams(amount)
    .store_uint(0, 107) ;; 106 zeroes +  0 as an indicator that there is no cell with the data
    .end_cell(); 
  send_raw_message(msg, 3); ;; mode, 2 for ignoring errors, 1 for sender pays fees, 64 for returning inbound message value
}