Function addZeroIfUnder10

addZeroIfUnder10(number: string | number): string | number
Adds a leading zero to a number if it is less than 10.
Parameters
- number: string | number
  The number to check and possibly modify.
Returns string | number
The original number with a leading zero if it was less than 10, otherwise the original number.
Example
```
addZeroIfUnder10(5); // returns "05"
addZeroIfUnder10(10); // returns 10
addZeroIfUnder10("3"); // returns "03"
addZeroIfUnder10("12"); // returns "12"
```
- Defined in functions/add-zero-if-under10/index.ts:15