my code
code_language.skript:
function editinventory(p: player):
open virtual chest inventory with size 3 named "&3EDITING" to {_p}
make a gui slot 0, 1, 2, 3, 4, 5, 6, 7 and 8 of {_p} with black stained glass pane named "&7 " to do nothing
if {inv.%{_p}%.0.saved} is set:
set slot 9 of {_p}'s current inventory to {inv.%{_p}%.0.saved}
set slot 10 of {_p}'s current inventory to {inv.%{_p}%.1.saved}
set slot 11 of {_p}'s current inventory to {inv.%{_p}%.2.saved}
set slot 12 of {_p}'s current inventory to {inv.%{_p}%.3.saved}
set slot 13 of {_p}'s current inventory to {inv.%{_p}%.4.saved}
set slot 14 of {_p}'s current inventory to {inv.%{_p}%.5.saved}
set slot 15 of {_p}'s current inventory to {inv.%{_p}%.6.saved}
set slot 16 of {_p}'s current inventory to {inv.%{_p}%.7.saved}
set slot 17 of {_p}'s current inventory to {inv.%{_p}%.8.saved}