View Compilation Error

0_0_22130003_21100.cpp: In function 'int main()':
0_0_22130003_21100.cpp:109:23: error: no matching function for call to 'Trie::insert()'
             ac.insert();
                       ^
0_0_22130003_21100.cpp:109:23: note: candidate is:
0_0_22130003_21100.cpp:25:10: note: void Trie::insert(char*)
     void insert(char buf[])
          ^
0_0_22130003_21100.cpp:25:10: note:   candidate expects 1 argument, 0 provided