Function default

default(str: string | null): string
Capitalizes the first letter of a string.
Parameters
- str: string | null
  The string to capitalize.
Returns string
The capitalized string.
Example
```
capitalizeFirstLetter('hello') // 'Hello'
capitalizeFirstLetter('hello world') // 'Hello world'
capitalizeFirstLetter('') // ''
```
- Defined in src/common/utils/capitalize-first-letter.ts:11