#include <vector>
#include <string>

std::string createString(){
	std::string hi("Hello world!");
	return hi;
}

std::vector<std::string> createVector(){
	std::vector<std::string> my_vector;
	my_vector.push_back(createString());
	my_vector.push_back(createString());
	my_vector.push_back(createString());
	return my_vector;
}

int putStringsInVector(int num){
	std::vector<std::string> my_strings;
	for(int i=0; i<num; i++){
		my_strings.push_back(createString());
	}
	return my_strings.size();
}

void modifyVector(std::vector<int> & vector){
	int count = 0;
	for(int i:vector){
		if(count % 5 == 0){
			i = 42;
		}
	}
}

#include <vector>
#include <string>

std::string createString(){
	std::string hi("Hello world!");
	return hi;
}

std::vector<std::string> createVector(){
	std::vector<std::string> my_vector;
	my_vector.push_back(createString());
	my_vector.push_back(createString());
	my_vector.push_back(createString());
	return my_vector;
}

int putStringsInVector(int num){
	std::vector<std::string> my_strings;
	for(int i=0; i<num; i++){
		my_strings.push_back(createString());
	}
	return my_strings.size();
}

--- 
+++ 
@@ -21,3 +21,12 @@
 	}
 	return my_strings.size();
 }
+
+void modifyVector(std::vector<int> & vector){
+	int count = 0;
+	for(int i:vector){
+		if(count % 5 == 0){
+			i = 42;
+		}
+	}
+}
Add code for function test.
