diff --git a/array/append.go~ b/array/append.go~
deleted file mode 100644
index b213107..0000000
--- a/array/append.go~
+++ /dev/null
@@ -1,24 +0,0 @@
-package main
-
-import "fmt"
-
-func main() {
-	ary := []int{}
-	for i := 0; i < 10; i++ {
-		ary = append(ary, i)
-		fmt.Printf("%d: %p cap:%d %v\n", i, ary,  cap(ary), ary)
-	}
-	/*
-	   0: 0x14000134008 cap:1 [0]
-	   1: 0x14000134030 cap:2 [0 1]
-	   2: 0x1400013a020 cap:4 [0 1 2]
-	   3: 0x1400013a020 cap:4 [0 1 2 3]
-	   4: 0x1400012c080 cap:8 [0 1 2 3 4]
-	   5: 0x1400012c080 cap:8 [0 1 2 3 4 5]
-	   6: 0x1400012c080 cap:8 [0 1 2 3 4 5 6]
-	   7: 0x1400012c080 cap:8 [0 1 2 3 4 5 6 7]
-	   8: 0x1400013c000 cap:16 [0 1 2 3 4 5 6 7 8]
-	   9: 0x1400013c000 cap:16 [0 1 2 3 4 5 6 7 8 9]
-	*/
-}
-