Made code style more consistent, use const reference in parameters, and removed a redundant check

include/FileHelper.h

@@ -1,13 +0,0 @@
-#ifndef FILEHELPER_H
-#define FILEHELPER_H
-
-class FileHelper {
-    public:
-        FileHelper() = default;
-        
-        ~FileHelper() = default;
-        
-        static bool fileExists(char *path);
-};
-
-#endif

include/FileReader.h

@@ -1,18 +0,0 @@
-#ifndef FILEREADER_H
-#define FILEREADER_H
-
-#include <string>
-#include <vector>
-
-using namespace std;
-
-class FileReader {
-    public:
-        FileReader() = default;
-        
-        ~FileReader() = default;
-        
-        static string getFile(char *path);
-};
-
-#endif

include/NumberUtils.h

@@ -1,5 +1,5 @@
-#ifndef NUMBERHELPER_H
-#define NUMBERHELPER_H
+#ifndef NUMBERUTILS_H
+#define NUMBERUTILS_H
 
 #include <string>
 #include <vector>
@@ -7,15 +7,15 @@
 
 using namespace std;
 
-class NumberHelper {
+class NumberUtils {
     public:
-        NumberHelper() = default;
+        NumberUtils() = default;
         
-        ~NumberHelper() = default;
+        ~NumberUtils() = default;
         
-        static vector<int> getRolls(string csv);
-        static bool validateRolls(vector<int> rolls);
-        static vector<Frame> createFrames(vector<int> rolls);
+        static vector<int> getRolls(const string& csv);
+        static bool validateRolls(const vector<int>& rolls);
+        static vector<Frame> createFrames(const vector<int>& rolls);
     
     private:
         static Frame createStrikeFrame(int i);

include/PrintFrames.h

@@ -14,8 +14,8 @@ class PrintFrames {
         ~PrintFrames() = default;
         
         static void printHeader();
-        static void printValue(string values);
-        static string parseValue(vector<Frame> frames);
+        static void printValue(const string& value);
+        static string parseValue(const vector<Frame>& frames);
 };
 
 #endif

include/ScoreCalculator.h

@@ -13,7 +13,7 @@ class ScoreCalculator {
         
         ~ScoreCalculator() = default;
         
-        static int getScore(vector<Frame> rolls);
+        static int getScore(const vector<Frame>& frames);
 };
 
 #endif