Function compile_contract 

pub fn compile_contract(
    output_dir: &Path,
    contract_path: &Path,
    runtime_bin: bool,
    abi_json: bool,
    remappings: Option<&[(&str, PathBuf)]>,
    allow_paths: &[&Path],
    optimize_runs: Option<u64>,
) -> Result<(), ContractCompilationError>