Extract `assert_not_paused` guard into a reusable helper function

[Kingsman-99]

Description

Many entry points in contracts/split/src/lib.rs start by reading StorageKey::Paused and returning ContractError::ContractPaused if true. Extracting this into fn assert_not_paused(env: &Env) -> Result<(), ContractError> reduces code duplication and makes the pause guard explicitly named in every entry point.

Acceptance Criteria

• Create fn assert_not_paused(env: &Env) -> Result<(), ContractError> in contracts/split/src/lib.rs (or a guards.rs module)
• Replace all inline pause checks with calls to this function
• No behaviour change
• cargo test passes

Context

• Target file: contracts/split/src/lib.rs

[ValJnr-dev1]

@ValJnr-dev1 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi Maintainer,

I’m a smart contract and full-stack developer and would love to contribute to this issue. I’m an experienced contributor with hands-on expertise in Rust, Soroban, Cairo, and TypeScript.

I’m passionate about building secure, scalable blockchain solutions, with a strong emphasis on writing clean and maintainable code. Based on the scope of this issue, I’m confident I can deliver a complete solution within 24 hours of assignment.

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[yahia008]

@yahia008 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

hi team kindly assign me i can work on this issue am a smart contract developer

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[grantfox-oss]

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@yahia008's PR #652 was approved and merged by @Kingsman-99.

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