Feat: refactor if-end jump logic

[mrLSD]

Description

Refactored if-end jump logic for if-condition state. Related to issue #9.

If-body block state

For the if-body block state, when called return anyway after this the JumpTo if-end instruction is called. It's redundant, refactored, and added an additional checks for label instruction JumpTo is manual-return for the current block state. If manual-return is set JumpTo context instruction is removed.

function-body block state

For the function-body block state should be added an additional check for manual-return. If it is set to true add the label return before the return instruction and also add the return instruction itself.

Other cases

• Checked the same cases for the if-else statement and refactored.
• Checked the same cases for the if-else-if statement - doesn't exist.
• Checked the same cases for the loop statement, as a conclusion: it's the only case for the if-condition statement.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files	Coverage Δ
src/semantic.rs	100.00% <100.00%> (ø)
tests/if_tests.rs	100.00% <100.00%> (ø)
tests/main_tests.rs	100.00% <100.00%> (ø)

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