`titleCase` insert extra space when convert a valid titleCase string

[ntnyq]

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Environment

Any

Reproduction

import { titleCase } from 'scule'

console.log(titleCase('Hello World')) // -> `Hello  World`

console.log(titleCase(titleCase('Hello World'))) // -> `Hello   World`

Describe the bug

It should be left as it is.

Additional context

No response

Logs

No response