v.utils: fix module lookup if module import parts end with the word modules (#21083)

.github/workflows/linux_ci.yml

@@ -57,6 +57,8 @@ jobs:
       #   run: V_CI_CSTRICT=1 ./v -cstrict test-self
       - name: Build examples
         run: ./v -W build-examples
+      - name: Run the submodule example, using a relative path
+        run: ./v -W run examples/submodule
       - name: Build v tools
         run: ./v -W build-tools
       - name: Build v binaries

examples/submodule/mymodules/main_functions.v

@@ -1,4 +1,4 @@
-module mymodule
+module mymodules
 
 pub fn add_xy(x int, y int) int {
 	return x + y

vlib/v/util/module.v

@@ -107,8 +107,9 @@ fn mod_path_to_full_name(pref_ &pref.Preferences, mod string, path string) !stri
 		}
 	}
 	mut in_vmod_path := false
+	parts := path.split(os.path_separator)
 	for vmod_folder in vmod_folders {
-		if path.contains(vmod_folder + os.path_separator) {
+		if vmod_folder in parts {
 			in_vmod_path = true
 			break
 		}