updated build script

Author: Kicshikxo

build.py

@@ -4,6 +4,6 @@
 system = platform.system()
 
 if (system == 'Windows'):
-    os.system("pyinstaller -F -w -i icon.ico main.py --hidden-import='PIL._tkinter_finder' && xcopy /Y assets/ dist/assets/ && xcopy /Y icon.png dist/")
+    os.system('pyinstaller -F -w -i icon.ico main.py --hidden-import="PIL._tkinter_finder" && xcopy /Y /I "assets\\" "dist\\assets\\" && xcopy /Y "icon.png" "dist\\"')
 elif (system == 'Linux'):
-    os.system("pyinstaller -F -w -i icon.png main.py --hidden-import='PIL._tkinter_finder' && /bin/cp -rf assets/ dist/ && /bin/cp -f icon.png dist/")
+    os.system('pyinstaller -F -w -i icon.png main.py --hidden-import="PIL._tkinter_finder" && /bin/cp -rf assets/ dist/ && /bin/cp -f icon.png dist/')