View Compilation Error

0_0_32463446_22419.cpp: In function 'void _insert(char*)':
0_0_32463446_22419.cpp:28:24: error: expected primary-expression at end of input
         int ch = str[k]-
                        ^
0_0_32463446_22419.cpp:28:24: error: expected ',' or ';' at end of input
0_0_32463446_22419.cpp:28:24: error: expected '}' at end of input
0_0_32463446_22419.cpp:28:24: error: expected '}' at end of input