- `Atoi` returns `0` if the `string` is not considered as a valid number. For this exercise **non-valid `string` chains will be tested**. Some will contain non-digits characters.
- `Atoi` returns `0` if the `string` is not considered as a valid number. For this exercise **non-valid `string` chains will be tested**. Some will contain non-digits characters.
- For this exercise the handling of the signs + or - **does have** to be taken into account.
- For this exercise the handling of the signs `+` or `-`**does have** to be taken into account.
- This function will **only** have to return the `int`. For this exercise the `error` result of `Atoi` is not required.
- This function will **only** have to return the `int`. For this exercise the `error` result of `Atoi` is not required.