Updated to fix errors with not clearing strings during encoding/decoding

SourceFiles/Vigenere.cpp

@@ -123,6 +123,7 @@ std::vector<unsigned int> Vigenere::getOffsets() const{
  * @return The encoded message
  */
 std::string Vigenere::encode(){
+	outputString = "";
 	//Reserve the correct size for the output string to increase speed for longer messages
 	outputString.reserve(inputString.size());
 
@@ -167,6 +168,7 @@ std::string Vigenere::encode(std::string key, std::string input){
  * @return The decoded message
  */
 std::string Vigenere::decode(){
+	outputString = "";
 	//Reserve the correct size for the output string to increase speed for longer messages
 	outputString.reserve(inputString.size());