Remove whitespace characters in cpp file

test/fixtures/cplusplus/main.cpp

@@ -14,14 +14,14 @@ int main(int argc, const char * argv[]) {
         std::cerr << "Usage: " << argv[0] << " FILE";
         return 1;
     }
-    
+
     std::ifstream t(argv[1]);
     std::string str((std::istreambuf_iterator<char>(t)),
                     std::istreambuf_iterator<char>());
 
     TopLevel tl = json::parse(str);
     json j2 = tl;
-    
+
     std::cout << j2 << std::endl;
 
     return 0;