/in/foo.c:6:5: error: unknown type name 'Node'
     Node* next;
     ^~~~
/in/foo.c: In function 'Search':
/in/foo.c:18:14: warning: assignment from incompatible pointer type [-Wincompatible-pointer-types]
         head = head->next;
              ^
/in/foo.c: In function 'Insert':
/in/foo.c:26:23: error: 'new' undeclared (first use in this function)
     struct Node* newp=new Node;
                       ^~~
/in/foo.c:26:23: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:26:27: error: expected ',' or ';' before 'Node'
     struct Node* newp=new Node;
                           ^~~~
/in/foo.c:38:18: warning: assignment from incompatible pointer type [-Wincompatible-pointer-types]
             temp = temp->next;
                  ^
/in/foo.c:40:19: warning: assignment from incompatible pointer type [-Wincompatible-pointer-types]
         temp->next= newp;
                   ^