View Compilation Error

0_0_17171159_28275.cpp: In function 'std::string add(std::string, std::string)':
0_0_17171159_28275.cpp:42:8: error: expected primary-expression at end of input
     for( 
        ^
0_0_17171159_28275.cpp:42:8: error: expected primary-expression at end of input
0_0_17171159_28275.cpp:42:8: error: expected ';' at end of input
0_0_17171159_28275.cpp:42:8: error: expected primary-expression at end of input
0_0_17171159_28275.cpp:42:8: error: expected ')' at end of input
0_0_17171159_28275.cpp:42:8: error: expected statement at end of input
0_0_17171159_28275.cpp:42:8: error: expected '}' at end of input