Warning: SPDX license identifier not provided in source file. Before publishing, consider adding a comment containing "SPDX-License-Identifier: <SPDX-License>" to each source file. Use "SPDX-License-Identifier: UNLICENSED" for non-open-source code. Please see https://spdx.org for more information.
--> message_format_utf16/input.sol

Warning: Source file does not specify required compiler version!
--> message_format_utf16/input.sol

Warning: Statement has no effect.
 --> message_format_utf16/input.sol:2:58:
  |
2 | /* ©©©©ﾩ©©©©© 2017 */ constructor () public { "©©©©ﾩ©©©©©" ; }
  |                                               ^^^^^^^^^^^^