Follow this steps to setup substrate development environment
Need to install the binaryen package, which is used to optimize the WebAssembly bytecode of the contract.
Many package managers have it available ‒ e.g. there is a package for Debian/Ubuntu, Homebrew and Arch Linux. If there is no proper package you can download the source code from github binaryen and compile for the binary.
After you've installed the package execute:
cargo install cargo-contract --vers ^0.12 --force --locked
We can check the installation using cargo contract --help
The smart contract code is available in the 'lib.js' file. To test it you can execute the below commands.
Quickly check that it compiles and the trivial test passes with:
cargo +nightly test
Also check that you can build the Wasm file by running:
cargo +nightly contract build
If everything looks good, then we are ready with the smart contract!