StringConcatenator

#include <string>

#include "StringConcatenator.h"
using namespace std;

StringConcatenator::StringConcatenator() = default;
StringConcatenator::~StringConcatenator() = default;

string StringConcatenator::concatenate(const ConcatenateStrategy strategy,
                                       const char*               left,
                                       const size_t              leftSize,
                                       const char*               right,
                                       const size_t              rightSize) const
    {
    string output = "";

    if(strategy == ConcatenateStrategy::LEFT_1_RIGHT_1)
    {
        string currentLeft = left;
        string currentRight = right;

        for(size_t i = 0; i < leftSize + rightSize; ++i)
        {
            if(currentLeft.empty())
            {
                output.append(currentRight);
                break;
            }
            if(currentRight.empty())
            {
                output.append(currentLeft);
                break;
            }
            output.append(sizeof(char), left[i]);
            currentLeft.erase(currentLeft.begin() + 0);
            output.append(sizeof(char), right[i]);
            currentRight.erase(currentRight.begin() + 0);
        }
        return output;
    }
    else if(strategy == ConcatenateStrategy::LEFT_2_RIGHT_1)
    {
        string currentLeft = left;
        string currentRight = right;

        for(size_t i = 0; i < leftSize + rightSize;)
        {
            if(currentLeft.empty())
            {
                output.append(currentRight);
                break;
            }
            if(currentRight.empty())
            {
                output.append(currentLeft);
                break;
            }
            output.append(sizeof(char), currentLeft[i]);
            currentLeft.erase(currentLeft.begin() + 0);
            output.append(sizeof(char), currentLeft[i]);
            currentLeft.erase(currentLeft.begin() + 0);
            output.append(sizeof(char), currentRight[i]);
            currentRight.erase(currentRight.begin() + 0);
            i = 0;
        }
        return output;
    }
    else
    {
        string currentLeft = left;
        string currentRight = right;

        for(size_t i = 0; i < leftSize + rightSize;)
        {
            if(currentLeft.empty())
            {
                output.append(currentRight);
                break;
            }
            if(currentRight.empty())
            {
                output.append(currentLeft);
                break;
            }
            output.append(sizeof(char), currentLeft[i]);
            currentLeft.erase(currentLeft.begin() + 0);
            output.append(sizeof(char), currentRight[i]);
            currentRight.erase(currentRight.begin() + 0);
            output.append(sizeof(char), currentRight[i]);
            currentRight.erase(currentRight.begin() + 0);
            i = 0;
        }
        return output;
    }
}