Function call_contract 

pub fn call_contract<E: EvmApi>(
    env: FunctionEnvMut<'_, WasmEnv<E>>,
    contract_ptr: u32,
    calldata_ptr: u32,
    calldata_len: u32,
    value_ptr: u32,
    gas: u64,
    ret_len_ptr: u32,
) -> Result<u8, Escape>

Execute a CALL.