Removed one more utils reference in the README and fixed directory name

Signed-off-by: Carlo Costino <carlo.costino@gsa.gov>

tests/notifications_utils/test_safe_string.py

@@ -0,0 +1,47 @@
+import pytest
+
+from notifications_utils.safe_string import (
+    make_string_safe_for_email_local_part,
+    make_string_safe_for_id,
+)
+
+
+@pytest.mark.parametrize(
+    "unsafe_string, expected_safe",
+    [
+        ("name with spaces", "name.with.spaces"),
+        ("singleword", "singleword"),
+        ("UPPER CASE", "upper.case"),
+        ("Service - with dash", "service.with.dash"),
+        ("lots      of spaces", "lots.of.spaces"),
+        ("name.with.dots", "name.with.dots"),
+        ("name-with-other-delimiters", "namewithotherdelimiters"),
+        (".leading", "leading"),
+        ("trailing.", "trailing"),
+        ("üńïçödë wördś", "unicode.words"),
+    ],
+)
+def test_email_safe_return_dot_separated_email_local_part(unsafe_string, expected_safe):
+    assert make_string_safe_for_email_local_part(unsafe_string) == expected_safe
+
+
+@pytest.mark.parametrize(
+    "unsafe_string, expected_safe",
+    [
+        ("name with spaces", "name-with-spaces"),
+        ("singleword", "singleword"),
+        ("UPPER CASE", "upper-case"),
+        ("Service - with dash", "service---with-dash"),
+        ("lots      of spaces", "lots-of-spaces"),
+        ("name.with.dots", "namewithdots"),
+        ("name-with-dashes", "name-with-dashes"),
+        ("N. London", "n-london"),
+        (".leading", "leading"),
+        ("-leading", "-leading"),
+        ("trailing.", "trailing"),
+        ("trailing-", "trailing-"),
+        ("üńïçödë wördś", "unicode-words"),
+    ],
+)
+def test_id_safe_return_dash_separated_string(unsafe_string, expected_safe):
+    assert make_string_safe_for_id(unsafe_string) == expected_safe