- Write a function that transforms a number within a `string`, in an `int`.
- Write a function that transforms numbers within a `string`, into an `int`.
- For this exercise the handling of the `-` sign **has** to be taken into account. If the sign is encountered before any number it should determine the sign of the returned `int`.
- If the `-` sign is encountered before any number it should determine the sign of the returned `int`.
- This function will**only** return an `int`. In case of invalid input, the function should return `0`.
- This function should**only** return an `int`. In the case of an invalid input, the function should return `0`.
- **Note**: There will never be more than one sign by`string` in the tests.
- **Note**: There will never be more than one sign in a`string` in the tests.