added realloc

mm.c

@@ -212,6 +212,35 @@ void mm_free(void *bp)
 	//~ }
 //~ }
 
+void *mm_realloc(void *ptr, size_t size) {
+    void *new_ptr = NULL;
+
+    if (ptr == NULL) {
+        return mm_malloc(size);
+    }
+
+    if (size == 0) {
+        mm_free(ptr);
+        return NULL;
+    }
+
+    struct block *oldblock = ptr - offsetof(struct block, payload);
+    size_t oldwords = blk_size(oldblock);
+    size_t oldsize = oldwords * WSIZE;
+    
+    if (!(new_ptr = mm_malloc(size))) {
+        return NULL;
+    }
+    if (size < oldsize) {
+        oldsize = size;
+    }
+    memcpy(new_ptr, ptr, oldsize);
+    mm_free(ptr);
+
+    return new_ptr;
+
+}
+
 static struct block *coalesce(struct block *bp) 
 {
     bool prev_alloc = prev_blk_footer(bp)->inuse;   /* is previous block allocated? */
@@ -275,9 +304,9 @@ static struct block *extend_heap(size_t words, int realloc)
     }
     list_push_front(find_list(words), &blk->elem);
 
-    // NOT IMPLEMENTED YET
-    //return coalesce(blk);
-    return NULL;
+    
+    return coalesce(blk);
+   
 }
 
 
@@ -342,7 +371,7 @@ static struct block *find_fit(size_t num_words)
 }
 
 team_t team = {
-    "?", // team name
+    "Micah Moore Felicia Seo",
     "Micah Moore",
     "micahmoore@vt.edu",
     "Felicia Seo",