- Write a function that simulates the behaviour of the `Atoi` function in Go. `Atoi` transforms a number defined as a `string` in a number defined as an `int`.
- Atoi returns `0` if the `string` is not considered as a valid number. For this exercise **only valid**`string` will be tested. They will only contain one or several digits as characters.
- `Atoi` returns `0` if the `string` is not considered as a valid number. For this exercise **only valid**`string` will be tested. They will only contain one or several digits as characters.
- For this exercise the handling of the signs `+` or `-` does not have to be taken into account.
- Write a function that simulates the behaviour of the `Atoi` function in Go. `Atoi` transforms a number defined as a `string` in a number defined as an `int`.
- 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 not have to be taken into account.
- This function will **only** have to return the `int`. For this exercise the `error` return of atoi is not required.
- This function will **only** have to return the `int`. For this exercise the `error` return of `Atoi` is not required.