Added C99 Solution

c99/GildedRose.c

@@ -0,0 +1,90 @@
+#include <string.h>
+#include "GildedRose.h"
+
+Item*
+init_item(Item* item, const char *name, int sellIn, int quality)
+{
+    item->sellIn = sellIn;
+    item->quality = quality;
+    item->name = strdup(name);
+    
+    return item;
+}
+
+void update_quality(Item items[], int size) 
+{
+    int i;
+    
+    for (i = 0; i < size; i++)
+    {
+        if (strcmp(items[i].name, "Aged Brie") && strcmp(items[i].name, "Backstage passes to a TAFKAL80ETC concert"))
+        {
+            if (items[i].quality > 0)
+            {
+                if (strcmp(items[i].name, "Sulfuras, Hand of Ragnaros"))
+                {
+                    items[i].quality = items[i].quality - 1;
+                }
+            }
+        }
+        else
+        {
+            if (items[i].quality < 50)
+            {
+                items[i].quality = items[i].quality + 1;
+
+                if (!strcmp(items[i].name, "Backstage passes to a TAFKAL80ETC concert"))
+                {
+                    if (items[i].sellIn < 11)
+                    {
+                        if (items[i].quality < 50)
+                        {
+                            items[i].quality = items[i].quality + 1;
+                        }
+                    }
+
+                    if (items[i].sellIn < 6)
+                    {
+                        if (items[i].quality < 50)
+                        {
+                            items[i].quality = items[i].quality + 1;
+                        }
+                    }
+                }
+            }
+        }
+
+        if (strcmp(items[i].name, "Sulfuras, Hand of Ragnaros"))
+        {
+            items[i].sellIn = items[i].sellIn - 1;
+        }
+
+        if (items[i].sellIn < 0)
+        {
+            if (strcmp(items[i].name, "Aged Brie"))
+            {
+                if (strcmp(items[i].name, "Backstage passes to a TAFKAL80ETC concert"))
+                {
+                    if (items[i].quality > 0)
+                    {
+                        if (strcmp(items[i].name, "Sulfuras, Hand of Ragnaros"))
+                        {
+                            items[i].quality = items[i].quality - 1;
+                        }
+                    }
+                }
+                else
+                {
+                    items[i].quality = items[i].quality - items[i].quality;
+                }
+            }
+            else
+            {
+                if (items[i].quality < 50)
+                {
+                    items[i].quality = items[i].quality + 1;
+                }
+            }
+        }
+    }
+}