Function titleCase

titleCase(str): string
Convert a string to PascalCase by capitalizing the first letter of each word.
Parameters
- str: string
  The input string.
Returns string
The string converted to PascalCase.
Example
```
// Returns 'HelloWorld'
titleCase('hello world');

// Returns 'Hello-world'
titleCase('hello-world');

// Returns 'HelloWorld'
titleCase('  hello world  ');
```

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