foo.c:1:6: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘:’ token
    1 | https://www.izhxy.com/#/selfTestTasks?key=GQXJArxSPiS9Gk0RSEwjUz1Z2S72bWQk-61pq5WEgebc5Zptf1MbkP0q-xG6FbUr3cECG5ICw5jGeSxzYVYqHmIa1mxKqqr1hr8IR5dVAAQ
      |      ^