Fix typo in test description: extact_lhs → extract_lhs

[Copilot]

Addresses review feedback on #19 to correct a typo in a test description.

Changes

• Fixed test description at line 208 of tests/testthat/test-helpfunctions_formulas_general.R
• Changed "extact_lhs" to "extract_lhs" to match the function name being tested

# Before
test_that("extact_lhs returns error for non-formula objects", {

# After  
test_that("extract_lhs returns error for non-formula objects", {

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.