How should I practice Normalize a DNS Domain Name?

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Problem · String

Normalize a DNS Domain Name

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Problem statement

Implement normalizeDnsName for the first step of a DNS resolver.

DNS names are case-insensitive, so convert every letter to lowercase.
By convention, a normalized DNS name ends with a trailing period (.). If the input does not already end with one, append it.

Function

normalizeDnsName(name: String) → String

Examples

Example 1

name = "Anthropic.COM"return = "anthropic.com."

The name is lowercased and receives the conventional trailing period.

Example 2

name = "api.Anthropic.com."return = "api.anthropic.com."

The existing trailing period is preserved rather than duplicated.

Problem statement

Function

Examples

Example 1

Example 2

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