opcode1negate push -1 on to the stack

[mubarak23]

• [x] issue #3
• [x] follows contribution guide
• [x] code change includes tests

Implemented code for opcode 1 negate that number -1 is pushed onto the stack.

[mubarak23]

The test is failing because of the below error.

String literals can only include ASCII characters. on this

let expected_stack = array!["\x81"];

\x81 is a hexadecimal representation of a character with the code 129, which is not an ASCII character.

println!("dstack result: {:?}", dstack);

dstack result: ["\x81"]

@b-j-roberts

[vercel[bot]]

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