Change arithmetic plus to DOLLAR PLUS

Author: albertZhangTJ

.github/workflows/main.yml

@@ -3,7 +3,7 @@ name: ci
 on:
   push:
     branches:
-      - main
+      - grammar_optimization
     paths:
       - 'src/**'
       - 'test/**'
@@ -13,6 +13,7 @@ on:
   pull_request:
     branches:
       - main
+      - grammar_optimization
     paths:
       - 'src/**'
       - 'test/**'