Update TODO.md

DataEraserC · web-flow · commit 1129a0d32dbd · 2022-12-23T13:22:51.000+08:00
diff --git a/c/TODO.md b/c/TODO.md
@@ -2,3 +2,4 @@
 
 - [ ] 2048 game
 - [ ] Gobang game
+- [ ] use macro/enum instead of direction number

Original file line number	Diff line number	Diff line change
`@@ -2,3 +2,4 @@`
`2`	`2`
`3`	`3`	`- [ ] 2048 game`
`4`	`4`	`- [ ] Gobang game`
	`5`	`+- [ ] use macro/enum instead of direction number`