Check web tutorials as well

tutorials/checker/build.gradle.kts

@@ -8,12 +8,12 @@ data class SnippetData(
 fun findSnippets(dirs: List<String>): List<SnippetData> {
   val snippets = mutableListOf<SnippetData>()
   dirs.forEach { dirName ->
-    rootProject
+    val dir = rootProject
       .projectDir
       .parentFile
       .resolve(dirName)
-      .listFiles()
-      .filter { it.name.endsWith(".md") }
+      .listFiles()?.let {
+        it.filter { it.name.endsWith(".md") }
           .forEach { file ->
             val currentSnippet = kotlin.text.StringBuilder()
             var snippetStart = 0
@@ -34,6 +34,7 @@ fun findSnippets(dirs: List<String>): List<SnippetData> {
         }
       }
     }
+  }
   return snippets
 }
 
@@ -78,13 +79,17 @@ fun checkDirs(dirs: List<String>) {
 // with whitespace marks code that shall not be checked.
 tasks.register("check") {
   doLast {
-    val dirs = project
+    for (dir in listOf(".", "Web")) {
+      val subdirs = project
         .projectDir
         .parentFile
+        .resolve(dir)
         .listFiles()
         .filter {
-        it.isDirectory && it.name[0].isUpperCase() }
+          it.isDirectory && it.name[0].isUpperCase()
+        }
         .map { it.name }
-    checkDirs(dirs)
+      checkDirs(subdirs.map { "$dir/$it" })
+    }
   }
 }