Fix opaque pointers in merge and remove wrappers.cpp

[edg-l]

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[github-actions]

Benchmarking factorial

Compiling factorial (factorial.con)
Finished release in 29.327349ms
Running 5000000 iterations
Using input value: 20
Concrete Result = 2432902008176640000 Time taken : 59.17 ms
Rust Result = 2432902008176640000 Time taken : 60.12 ms

Benchmarking fib

Compiling fib (fib.con)
Finished release in 25.590012ms
Running 5000 iterations
Using input value: 20
Concrete Result = 6765 Time taken : 136.02 ms
Rust Result = 6765 Time taken : 85.31 ms