View Compilation Error

0_0_5511358_4276.cpp: In function `std::string bigstringadd(std::string, std::string, std::string)':
0_0_5511358_4276.cpp:8: error: declaration of 'std::string c' shadows a parameter
0_0_5511358_4276.cpp: In function `int main()':
0_0_5511358_4276.cpp:6: error: too few arguments to function `std::string bigstringadd(std::string, std::string, std::string)'
0_0_5511358_4276.cpp:28: error: at this point in file