String Cat Function

#include<iostream>
char * strCat(char *destination, const char*entered) {
	int length = 0;
	if (destination == "") {
		length = 0;
	}
	else {
		for (size_t i = 0; destination[i] != '\0'; i++)
		{
			length++;
		}
	}
	int i = 0;
	while (entered[i] != '\0') {
		destination[length + i] = entered[i];
		i++;
	}
	return destination;
}
int main()
{
	char buffer[100]="";
	strCat(buffer, "dario");
	strCat(buffer, "e");
	strCat(buffer, "najjak");
	strCat(buffer, " ");
	std::cout << strCat(buffer, "covek");
	std::cin.get(); std::cin.get();
}