View Compilation Error

0_0_31458240_21135.cpp: In function 'int sum(char*, char*, char*)':
0_0_31458240_21135.cpp:38:8: error: expected primary-expression at end of input
      c =
        ^
0_0_31458240_21135.cpp:38:8: error: expected '}' at end of input
0_0_31458240_21135.cpp:38:8: error: expected '}' at end of input
0_0_31458240_21135.cpp:38:8: error: expected '}' at end of input
0_0_31458240_21135.cpp:38:8: error: expected '}' at end of input