diff --git a/hw3/src/main.c b/hw3/src/main.c
index 6401ea0..369b67a 100644
--- a/hw3/src/main.c
+++ b/hw3/src/main.c
@@ -3,11 +3,5 @@
 
 int main(int argc, char const *argv[])
 {
-    size_t sz_x = sizeof(int), sz_y = 10, sz_x1 = sizeof(int) * 20;
-	void *x = sf_malloc(sz_x);
-	/* void *y = */ sf_malloc(sz_y);
-	sf_realloc(x, sz_x1);
-
-    sf_show_heap();
     return EXIT_SUCCESS;
 }
diff --git a/hw3/src/sfmm.c b/hw3/src/sfmm.c
index a0fe8d6..910ef93 100644
--- a/hw3/src/sfmm.c
+++ b/hw3/src/sfmm.c
@@ -45,14 +45,12 @@ sf_block *get_prev_block(sf_block *block);
 sf_block *get_next_block(sf_block *block);
 void remove_list(sf_block *block);
 sf_size_t get_pow(sf_size_t pow);
-void xor_with_magic(sf_header *header);
 void add_payload(int size);
 
 void *sf_malloc(sf_size_t size)
 {
     if (size == 0)
         return NULL;
-
     if (sf_mem_start() == sf_mem_end())
         if (sf_initialize())
             return NULL;
@@ -291,16 +289,16 @@ void set_header(sf_block *block, sf_header value)
     {
         next->prev_footer = block->header;
         if ((prv_alloc & (sf_size_t)MAGIC) == 0)
-            next->header = next->header & ~prv_alloc;
+            next->header = next->header & ~((uint64_t)prv_alloc);
         else
-            next->header = next->header | prv_alloc;
+            next->header = next->header | (uint64_t)prv_alloc;
     }
     else
     {
         if ((prv_alloc & (sf_size_t)MAGIC) == 0)
-            next->header = next->header | prv_alloc;
+            next->header = next->header | (uint64_t)prv_alloc;
         else
-            next->header = next->header & ~prv_alloc;
+            next->header = next->header & ~((uint64_t)prv_alloc);
     }
 }
 
@@ -335,13 +333,9 @@ void set_alloc(sf_block *block, sf_size_t is_alloc)
     sf_header header = block->header ^ MAGIC;
     sf_header value = header;
     if (is_alloc)
-    {
-        value |= alloc;
-    }
+        value |= (uint64_t)alloc;
     else
-    {
         value &= (~((uint64_t)alloc));
-    }
     set_header(block, value);
 }
 
@@ -350,28 +344,19 @@ void set_prv_alloc(sf_block *block, sf_size_t is_prv_allc)
     sf_header header = block->header ^ MAGIC;
     sf_header value = header;
     if (is_prv_allc)
-    {
-        value |= prv_alloc;
-    }
+        value |= (uint64_t)prv_alloc;
     else
-    {
         value &= (~((uint64_t)prv_alloc));
-    }
     set_header(block, value);
 }
 
 void set_in_qklst(sf_block *block, sf_size_t is_in_qklst)
 {
-    sf_header header = block->header ^ MAGIC;
-    sf_header value = header;
+    sf_header value = block->header ^ MAGIC;
     if (is_in_qklst)
-    {
-        value |= in_qklst;
-    }
+        value |= (uint64_t)in_qklst;
     else
-    {
         value &= (~((uint64_t)in_qklst));
-    }
     set_header(block, value);
 }
 
@@ -500,9 +485,4 @@ void remove_list(sf_block *block)
 {
     block->body.links.next->body.links.prev = block->body.links.prev;
     block->body.links.prev->body.links.next = block->body.links.next;
-}
-
-void xor_with_magic(sf_header *header)
-{
-    *header ^= MAGIC;
 }
\ No newline at end of file
diff --git a/hw3/tests/sfmm_tests.c b/hw3/tests/sfmm_tests.c
index 9d2c513..850e334 100644
--- a/hw3/tests/sfmm_tests.c
+++ b/hw3/tests/sfmm_tests.c
@@ -254,7 +254,6 @@ Test(sfmm_basecode_suite, realloc_larger_block, .timeout = TEST_TIMEOUT)
 				 sf_internal_fragmentation(), 90 / 128.0);
 	cr_assert_eq(sf_peak_utilization(), 90 / 1024.0, "Wrong number of sf_peak_utilization(): (exp=%f, found=%f)",
 				 sf_peak_utilization(), 90 / 1024.0);
-
 }
 
 Test(sfmm_basecode_suite, realloc_smaller_block_splinter, .timeout = TEST_TIMEOUT)
@@ -279,6 +278,10 @@ Test(sfmm_basecode_suite, realloc_smaller_block_splinter, .timeout = TEST_TIMEOU
 	assert_quick_list_block_count(0, 0);
 	assert_free_block_count(0, 1);
 	assert_free_block_count(880, 1);
+	cr_assert_eq(sf_internal_fragmentation(), 64 / 96.0, "Wrong number of sf_internal_fragmentation(): (exp=%f, found=%f)",
+				 sf_internal_fragmentation(), 64 / 96.0);
+	cr_assert_eq(sf_peak_utilization(), 80 / 1024.0, "Wrong number of sf_peak_utilization(): (exp=%f, found=%f)",
+				 sf_peak_utilization(), 80 / 1024.0);
 }
 
 Test(sfmm_basecode_suite, realloc_smaller_block_free_block, .timeout = TEST_TIMEOUT)
@@ -305,6 +308,10 @@ Test(sfmm_basecode_suite, realloc_smaller_block_free_block, .timeout = TEST_TIME
 	assert_quick_list_block_count(0, 0);
 	assert_free_block_count(0, 1);
 	assert_free_block_count(944, 1);
+	cr_assert_eq(sf_internal_fragmentation(), 4 / 32.0, "Wrong number of sf_internal_fragmentation(): (exp=%f, found=%f)",
+				 sf_internal_fragmentation(), 4 / 32.0);
+	cr_assert_eq(sf_peak_utilization(), 64 / 1024.0, "Wrong number of sf_peak_utilization(): (exp=%f, found=%f)",
+				 sf_peak_utilization(), 64 / 1024.0);
 }
 
 //############################################
@@ -344,6 +351,10 @@ Test(sfmm_basecode_suite, quicklist1, .timeout = TEST_TIMEOUT)
 	cr_assert_eq(&bp->header, (char *)x6 - 8,
 				 "Wrong first block in free list %d: (found=%p, exp=%p)",
 				 i, &bp->header, (char *)x6 - 8);
+	cr_assert_eq(sf_internal_fragmentation(), 0, "Wrong number of sf_internal_fragmentation(): (exp=%f, found=%f)",
+				 sf_internal_fragmentation(), 0);
+	cr_assert_eq(sf_peak_utilization(), 24 / 1024.0, "Wrong number of sf_peak_utilization(): (exp=%f, found=%f)",
+				 sf_peak_utilization(), 24 / 1024.0);
 }
 
 Test(sfmm_basecode_suite, quicklist2, .timeout = TEST_TIMEOUT)
@@ -372,6 +383,10 @@ Test(sfmm_basecode_suite, quicklist2, .timeout = TEST_TIMEOUT)
 	cr_assert_eq(&bp->header, (char *)x1 - 8,
 				 "Wrong first block in free list %d: (found=%p, exp=%p)",
 				 i, &bp->header, (char *)x1 - 8);
+	cr_assert_eq(sf_internal_fragmentation(), 0, "Wrong number of sf_internal_fragmentation(): (exp=%f, found=%f)",
+				 sf_internal_fragmentation(), 0);
+	cr_assert_eq(sf_peak_utilization(), 20 / 1024.0, "Wrong number of sf_peak_utilization(): (exp=%f, found=%f)",
+				 sf_peak_utilization(), 20 / 1024.0);
 }
 
 Test(sfmm_basecode_suite, realloc1, .timeout = TEST_TIMEOUT)
@@ -384,6 +399,10 @@ Test(sfmm_basecode_suite, realloc1, .timeout = TEST_TIMEOUT)
 	assert_free_block_count(0, 2);
 	assert_free_block_count(12000, 1);
 	assert_free_block_count(528, 1);
+	cr_assert_eq(sf_internal_fragmentation(), (12000-8)/12000.0, "Wrong number of sf_internal_fragmentation(): (exp=%f, found=%f)",
+				 sf_internal_fragmentation(), (12000-8)/12000.0);
+	cr_assert_eq(sf_peak_utilization(), (12000-8) / 24576.0, "Wrong number of sf_peak_utilization(): (exp=%f, found=%f)",
+				 sf_peak_utilization(), (12000-8) / 24576.0);
 }
 
 Test(sfmm_basecode_suite, realloc2, .timeout = TEST_TIMEOUT)
@@ -402,6 +421,10 @@ Test(sfmm_basecode_suite, realloc2, .timeout = TEST_TIMEOUT)
 	cr_assert_eq(114514, (int)*x3,
 				 "Wrong value: (found=%d, exp=%d)",
 				 114514, (int)*x3);
+	cr_assert_eq(sf_internal_fragmentation(), (24004)/24048.0, "Wrong number of sf_internal_fragmentation(): (exp=%f, found=%f)",
+				 sf_internal_fragmentation(), (24004)/24048.0);
+	cr_assert_eq(sf_peak_utilization(), (24004) / 24576.0, "Wrong number of sf_peak_utilization(): (exp=%f, found=%f)",
+				 sf_peak_utilization(), (24004) / 24576.0);
 }
 
 Test(sfmm_basecode_suite, freepro, .signal = SIGABRT, .timeout = TEST_TIMEOUT)