fix: handle cases when parent directory name includes dot/hyphen/space

examples/postman_echo/request_methods/validate_with_functions.yml

@@ -1,29 +0,0 @@
-config:
-    name: "request methods testcase: validate with functions"
-    variables:
-        foo1: session_bar1
-    base_url: "https://postman-echo.com"
-    verify: False
-
-teststeps:
--
-    name: get with params
-    variables:
-        foo1: bar1
-        foo2: session_bar2
-        sum_v: "${sum_two(1, 2)}"
-    request:
-        method: GET
-        url: /get
-        params:
-            foo1: $foo1
-            foo2: $foo2
-            sum_v: $sum_v
-        headers:
-            User-Agent: HttpRunner/${get_httprunner_version()}
-    extract:
-        session_foo2: "body.args.foo2"
-    validate:
-        - eq: ["status_code", 200]
-        - eq: ["body.args.sum_v", "3"]
-#        - less_than: ["body.args.sum_v", "${sum_two(2, 2)}"]   TODO