fixed error in script due to variable name

sqrt.py

@@ -9,8 +9,7 @@
 @click.command()
 @click.option("--n", type=int, required=True, help="Number for which the square root should be calculated")
 def main(n):
-    print(math.sqrt(number))
-    return math.sqrt(number)
+    print(math.sqrt(n))
 
 if __name__ == "__main__":
     main()