foo.cc: In function 'void mul1(char*, char*)':
foo.cc:31:46: error: expected primary-expression before ')' token
   31 |                 for(int i = 0;i <= l1+l2-2;++)
      |                                              ^
foo.cc: In function 'void mul2(char*, char*)':
foo.cc:80:9: error: expected '}' before 'else'
   80 |         else
      |         ^~~~
foo.cc:72:9: note: to match this '{'
   72 |         {
      |         ^

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