Update unreal script to only pull the repo if it doesn't exist on the system

scripts/unrealenginesetup.sh

@@ -11,8 +11,10 @@ read -p "Enter your github token: " token
 while true; do
     read -p "What release of Unreal Would you like? (Please check the Unreal repository for release numbers): " answer
     cd $software_PATH
+    if [[ ! -d $software_PATH/UnrealEngine ]]; then
         git clone https://github.com/EpicGames/UnrealEngine "UnrealEngine$answer"
-    cd "UnrealEngine$answer"
+    fi
+    cd "$software_PATH/UnrealEngine$answer"
     git checkout "$answer-release"
     bash Setup.sh
     bash GenerateProjectFiles.sh
@@ -36,7 +38,9 @@ Categories=Development;Animation;
     if [[ ! -d /home/$(whoami)/.local/share/applications ]]; then
         mkdir /home/$(whoami)/.local/share/applications
     fi
+
     ln -s "$software_PATH/UnrealEngine$answer/UnrealEngine$answer.desktop" ".local/share/applications/"
+
     while true; do
         read -p "Do you want to install another version? (y/n) " response
         if [[ "${response,,}" == "n" ]]; then
@@ -47,9 +51,11 @@ Categories=Development;Animation;
             "Invalid Response (y/n)"
         fi
     done
+
     if [[ "${response,,}" == "y" ]]; then
         echo -n ""
     else
         break
     fi
+
 done