Added testing ability

For the full details, see patches/README.md :-)

patches/eowyn.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+#
+#     "I will be a shieldmaiden no longer,
+#      nor vie with the great Riders, nor
+#      take joy only in the songs of slaying.
+#      I will be a healer, and love all things
+#      that grow and are not barren."
+#             Éowyn, The Return of the King
+#
+#
+# This script shall heal the little broken programs
+# using the patches in this directory and convey them
+# to convalesce in the healed directory.
+#
+
+# We run from the patches dir. Go there now if not already.
+cd $(dirname $(which $0))
+pwd # Show it upon the screen so all shall be made apparent.
+
+# Create healed/ directory here if it doesn't already exist.
+mkdir -p healed
+
+# Cycle through all the little broken Zig applications.
+for broken in ../exercises/*.zig
+do
+    # Remove the dir and extension, rendering the True Name.
+    true_name=$(basename $broken .zig)
+
+    if [[ -f $true_name.patch ]]
+    then
+        # Apply the bandages to the wounds, grow new limbs, let
+        # new life spring into the broken bodies of the fallen.
+        echo Healing $true_name...
+        patch --output=healed/$true_name.zig $broken $true_name.patch
+    else
+        echo Cannot heal $true_name. Making empty patch.
+        echo > $true_name.patch
+    fi
+done
+
+# Return to the home of our ancestors.
+cd ..
+
+# Test the healed exercises. May the compiler have mercy upon us.
+zig build -Dhealed