diff --git a/calc.py b/calc.py
index 7022ef9..df8657f 100644
--- a/calc.py
+++ b/calc.py
@@ -1,9 +1,11 @@
 
 def add(x,y):
-	return x+y
+return x+y	
 def subtract(x,y):
 	pass
 def multiply(x,y):
 	pass
 def divide(x,y):
-	return x/y
+pass
+def square(x,y):
+pass
diff --git a/git-sample b/git-sample
new file mode 160000
index 0000000..39f45f8
--- /dev/null
+++ b/git-sample
@@ -0,0 +1 @@
+Subproject commit 39f45f82186ff48a95d668f768f77f479e204d02