View Compilation Error

0_0_24785761_23235.cpp: In member function 'int ac_auto::insert(const char*)':
0_0_24785761_23235.cpp:35:15: error: duplicate 'const'
         const const *ptr = str;
               ^
0_0_24785761_23235.cpp:35:28: error: cannot convert 'const char*' to 'const int*' in initialization
         const const *ptr = str;
                            ^
0_0_24785761_23235.cpp:44:22: error: invalid operands of types 'const char*' and 'const int*' to binary 'operator-'
         return str - ptr;
                      ^