Fix input for unsigned char *

[edeguine]

For some reason in Xcode 14.1 passing the unsigned char * around does not work, we fix the issue using https://github.com/pytorch/ios-demo-app/pull/76/files#diff-327fd30c5fc0ebceb86a18a77d02ec09c2bc511189122e99216de97a88b9cf5f as reference

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