foo.c:1:1: error: stray '`' in program
    1 | ```c
      | ^
foo.c:1:2: error: stray '`' in program
    1 | ```c
      |  ^
foo.c:1:3: error: stray '`' in program
    1 | ```c
      |   ^
foo.c:1:5: error: expected ';' before 'typedef'
    1 | ```c
      |     ^
      |     ;

[Hydro](https://hydro.ac)提供评测服务