diff --git a/tests/cidr4_merge/test_cidr4_merger.py b/tests/cidr4_merge/test_cidr4_merger.py
index 49df2f3..23995c4 100644
--- a/tests/cidr4_merge/test_cidr4_merger.py
+++ b/tests/cidr4_merge/test_cidr4_merger.py
@@ -4,8 +4,8 @@ from vpn_manager.cidr4_merge.cidr4_merger import (
     find_neighbors,
     find_parent,
     make_cidr4,
-    merge_nodes,
     merge_two_nodes,
+    solution,
 )
 
 
@@ -97,7 +97,7 @@ def test_find_neighbors():
 
 
 def test_merge_nodes():
-    assert merge_nodes(
+    assert solution(
         [
             (0, 32),
             (3, 32),
@@ -106,7 +106,7 @@ def test_merge_nodes():
         2,
     ) == ([(0, 30), (4, 32)], 2)
 
-    assert merge_nodes(
+    assert solution(
         [
             (0, 32),
             (3, 32),
@@ -116,7 +116,7 @@ def test_merge_nodes():
         2,
     ) == ([(0, 29)], 4)
 
-    assert merge_nodes(
+    assert solution(
         [
             (0, 32),
             (3, 32),
diff --git a/vpn_manager/cidr4_merge/cidr4_merger.py b/vpn_manager/cidr4_merge/cidr4_merger.py
index 74524d4..024df9b 100644
--- a/vpn_manager/cidr4_merge/cidr4_merger.py
+++ b/vpn_manager/cidr4_merge/cidr4_merger.py
@@ -37,7 +37,7 @@ def merge_two_nodes(a: Node, b: Node) -> tuple[Node, int]:
     return p, dip
 
 
-def merge_nodes(nodes: list[Node], req_len: int) -> tuple[list[Node], int]:
+def solution(nodes: list[Node], req_len: int) -> tuple[list[Node], int]:
     sum_dip = 0
     while len(nodes) > req_len:
         min_t = None, None, float("inf")
@@ -92,7 +92,7 @@ def main():
     nodes = sorted(map(cidr4_to_node, data))
     ensure_no_subnets(nodes)
     ensure_no_neighbors(nodes)
-    merged_nodes, sum_dip = merge_nodes(nodes, required_len)
+    merged_nodes, sum_dip = solution(nodes, required_len)
     cidr4s = [make_cidr4(ip, mask_len) for ip, mask_len in merged_nodes]
     print(cidr4s, sum_dip, sep="\n")