constant `MAX_COUNTRY_LEN` is never used

constant `MAX_AREA_LEN` is never used

constant `MAX_LOCAL_LEN` is never used

constant `PHONE_NUMBER_MINIMUM_DIGITS` is never used

function `is_sdd` is never used

function `is_digit` is never used

function `is_digit_or_ssd` is never used

function `eat_while_digit_or_sdd_but_spare_last_digit` is never used

function `internal_telephone_number` is never used

function `telephone_number` is never used

The following actions uses node12 which is deprecated and will be forced to run on node16: actions-rs/toolchain@v1, actions/cache@v2, actions-rs/cargo@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/