Function appendIfMissingIgnoreCase

appendIfMissingIgnoreCase(text?, suffix?): string | undefined | null
Returns a string that concat the given text and suffix, case-insensitive
Parameters
- Optionaltext: null | string
  the text to check
- Optionalsuffix: null | string
  the suffix to append
Returns string | undefined | null
a string that concat the given text and suffix, case-insensitive
Example
```
appendIfMissingIgnoreCase('foo', 'bar');    // 'foobar'
appendIfMissingIgnoreCase('foobar', 'BAR');    // 'foobar'
```