Fix block/loop label indices · RoyalIcing/Orb@7c8be06

The following actions uses Node.js version which is deprecated and will be forced to run on node20: actions/checkout@v3, actions/cache@v3. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

variable "char" is unused (if the variable is not meant to be used, prefix it with an underscore)

function do_wasm_type/2 is unused

function extract_wasm_section/2 is unused

function extract_wasm_sections/1 is unused

variable "i" is unused (if the variable is not meant to be used, prefix it with an underscore)

variable "j" is unused (if the variable is not meant to be used, prefix it with an underscore)

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