Add trailing slash to namespace strings

[xinaizha]

Issue #, if available:

Description of changes:
Add trailing slash to namespace strings

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[jariy17]

Could you expand on this PR with more details:

• What is the problem?
• How should we fix it?
• How can we verify the fix works?
  Once we have this information, we can review your PR

[xinaizha]

1. The problem: We are using namespace with trailing slash as the standard/default convention, so we want to ensure all memory namespace examples consistently use trailing slashes for proper path parsing and prefix matching.
2. To fix it: end each namespace with a trailing slash.
3. Test: have done unit tests