add new function and module

app.R

@@ -2,5 +2,8 @@ library(plumber)
 library(tidyverse)
 # 'plumber.R' is the location of the file shown above
 
-pr("function.R") %>%
+pr() %>% 
+  pr_mount("/a", path = "services/a_services.R") %>% 
+  pr_mount("/b", path = "services/b_services.R") %>% 
+  pr_mount("/utils", path = "function.R") %>%
   pr_run(host = "0.0.0.0", port=7860)

services/a_services.R

@@ -0,0 +1,9 @@
+#* check if API run successfully
+#* @serializer unboxedJSON
+#* @get /check
+function() {
+  message("--- message from service a")
+  list(
+    message = "Hello, dev!"
+  )
+}

services/b_services.R

@@ -0,0 +1,9 @@
+#* check if API run successfully
+#* @serializer unboxedJSON
+#* @get /check
+function() {
+  message("--- message from service b")
+  list(
+    message = "Hello, dev!"
+  )
+}