diff --git a/goulag_sort/goulagsort.py b/goulag_sort/goulagsort.py
index d5087a8..ce4a191 100644
--- a/goulag_sort/goulagsort.py
+++ b/goulag_sort/goulagsort.py
@@ -47,11 +47,17 @@ def send_to_goulag(input_list:list)-> list :
 
     idx = 0
     temp = []
+    is_sorted = True
     while True:
 
         if not input_list:
             return []
 
+        if len(input_list)<=1:
+            return input_list
+
+
+
         while idx < len(input_list) - 1:
             if input_list[idx] > input_list[idx + 1]:
                 temp.append(input_list[idx + 1])
@@ -66,16 +72,48 @@ def send_to_goulag(input_list:list)-> list :
 
         idx = 0
         # Loop para reinserir elementos de 'temp' na lista principal
-        while idx < len(input_list):
-            if temp and input_list[idx] > temp[0]:
-                # Inserção no meio da lista input_list[idx:idx] = temp é O(N) no pior caso
-                input_list[idx:idx] = temp
-                temp.clear()
-                break
-            idx += 1
-            if len(temp) == 0:
-                return input_list
+        merge_two_sorted_lists_in_place(input_list,temp)
 
         if temp:
             input_list.extend(temp)  # extend é O(k) onde k é o tamanho de temp
-            temp.clear()
\ No newline at end of file
+            temp.clear()
+
+        for i in range(len(input_list) - 1):
+            if input_list[i] > input_list[i + 1]:
+                is_sorted = False
+                break
+        if is_sorted:
+            return input_list
+
+def merge_two_sorted_lists_in_place(list1: list, list2: list) -> list:
+
+    if not list2:
+        return list1
+    if not list1:
+        list1.extend(list2)
+        list2.clear()
+        return list1
+
+
+    ptr1 = 0
+    ptr2 = 0
+
+
+    while ptr1 < len(list1) and ptr2 < len(list2):
+        if list1[ptr1] > list2[ptr2]:
+
+            list1.insert(ptr1, list2[ptr2])
+
+            ptr1 += 1
+
+            list2.pop(ptr2)
+        else:
+
+            ptr1 += 1
+
+
+    if list2:
+        list1.extend(list2)
+        list2.clear() # Esvazia list2
+
+    return list1
\ No newline at end of file