how to grab argument from command

public class CommandGimme : IRocketCommand
    {
        public AllowedCaller AllowedCaller => AllowedCaller.Both;

        public string Name => "gimme";

        public string Help => "give an item";

        public string Syntax => "no syntax";

        public List<string> Aliases => new List<string>();

        public List<string> Permissions => new List<string>() { "custom.gimme" };

        public void Execute(IRocketPlayer caller, string[] command)
        {
            Rocket.Core.R.Commands.Execute(caller, "/i ", ARGUMENT VARIABLE);
        }
    }