Function capitalizeFirstLetterOnly

capitalizeFirstLetterOnly(str: string): string
Capitalize the first letter of a string, and make the rest lowercase.
Parameters
- str: string
  The string to transform
Returns string
The original string with all letters lowercase except the first which is capitalized
Example
```
console.log(capitalizeFirstLetterOnly("WATER")); // prints "Water"
```
- Defined in src/utils/strings.ts:82