foo.cc: In function 'void Unique()':
foo.cc:30:8: error: 'head1' was not declared in this scope
   30 |     p1=head1;
      |        ^~~~~
foo.cc:31:8: error: 'head2' was not declared in this scope
   31 |     p2=head2;
      |        ^~~~~
foo.cc: In function 'int main()':
foo.cc:69:11: error: too many arguments to function 'void Unique()'
   69 |     Unique(head1);
      |     ~~~~~~^~~~~~~
foo.cc:25:6: note: declared here
   25 | void Unique()
      |      ^~~~~~
foo.cc:70:11: error: too many arguments to function 'void Unique()'
   70 |     Unique(head2);
      |     ~~~~~~^~~~~~~
foo.cc:25:6: note: declared here
   25 | void Unique()
      |      ^~~~~~

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