foo.c: In function 'gy':
foo.c:2:21: error: expected declaration specifiers before '\U0000ff1b'
    2 | int gy(int a ,int b)；
      |                     ^~
foo.c:20:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
   20 | {
      | ^
foo.c:42:1: error: expected '=', ',', ';', 'asm' or '__attribute__' before '{' token
   42 | {
      | ^
foo.c:63: error: expected '{' at end of input
foo.c:63: warning: control reaches end of non-void function [-Wreturn-type]

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