Removed spaces from top-level directory names.

Spaces tend to cause annoyances in a Unix-style shell environment.
This change fixes that.

84_Super_Star_Trek/csharp/Systems/ShieldControl.cs

@@ -0,0 +1,59 @@
+using SuperStarTrek.Commands;
+using SuperStarTrek.Objects;
+using SuperStarTrek.Resources;
+using SuperStarTrek.Space;
+
+namespace SuperStarTrek.Systems
+{
+    internal class ShieldControl : Subsystem
+    {
+        private readonly Enterprise _enterprise;
+        private readonly Output _output;
+        private readonly Input _input;
+
+        internal ShieldControl(Enterprise enterprise, Output output, Input input)
+            : base("Shield Control", Command.SHE, output)
+        {
+            _enterprise = enterprise;
+            _output = output;
+            _input = input;
+        }
+
+        internal float ShieldEnergy { get; set; }
+
+        protected override bool CanExecuteCommand() => IsOperational("{name} inoperable");
+
+        protected override CommandResult ExecuteCommandCore(Quadrant quadrant)
+        {
+            _output.WriteLine($"Energy available = {_enterprise.TotalEnergy}");
+            var requested = _input.GetNumber($"Number of units to shields");
+
+            if (Validate(requested))
+            {
+                ShieldEnergy = requested;
+                _output.Write(Strings.ShieldsSet, requested);
+            }
+            else
+            {
+                _output.WriteLine("<SHIELDS UNCHANGED>");
+            }
+
+            return CommandResult.Ok;
+        }
+
+        private bool Validate(float requested)
+        {
+            if (requested > _enterprise.TotalEnergy)
+            {
+                _output.WriteLine("Shield Control reports, 'This is not the Federation Treasury.'");
+                return false;
+            }
+
+            return requested >= 0 && requested != ShieldEnergy;
+        }
+
+        internal void AbsorbHit(int hitStrength) => ShieldEnergy -= hitStrength;
+
+        internal void DropShields() => ShieldEnergy = 0;
+    }
+}