/in/foo.cc: In function 'int main()':
/in/foo.cc:14:11: error: 'strlwr' was not declared in this scope
 strlwr(key);
           ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:33:5: error: redefinition of 'int main()'
 int main()
     ^~~~
/in/foo.cc:4:5: note: 'int main()' previously defined here
 int main()
     ^~~~
/in/foo.cc:43:11: error: 'strlwr' was not declared in this scope
 strlwr(key);
           ^