Function ffi_validate_config 

pub unsafe fn ffi_validate_config<F>(
    level_ptr: *const u8,
    level_len: usize,
    config_ptr: *const u8,
    config_len: usize,
    validate_fn: F,
) -> *mut u8
where
    F: Fn(ConfigLevel, JSON, &Utils) -> Vec<ValidationError>,

Helper for implementing _validate_config WASM export

Safety

This function is unsafe because it works with raw pointers from WASM.