Works for me. Thanks!

I cannot submit my solution.

When I run simple tests I get that error:

Test Results:
Build Failed
# codewarrior/kata_test
./kata_test.go:6:3: imported and not used: "codewarrior/kata"
./kata_test.go:11:16: undefined: ValidParentheses
./kata_test.go:12:16: undefined: ValidParentheses

if I click on Attempt button I get that:

Test Results:
Build Failed
 STDERR
# codewarrior/kata_test
./kata_test.go:10:3: imported and not used: "codewarrior/kata"
./kata_test.go:15:16: undefined: ValidParentheses
./kata_test.go:16:16: undefined: ValidParentheses
./kata_test.go:17:16: undefined: ValidParentheses
./kata_test.go:18:16: undefined: ValidParentheses
./kata_test.go:19:16: undefined: ValidParentheses
./kata_test.go:20:16: undefined: ValidParentheses
./kata_test.go:24:16: undefined: ValidParentheses
./kata_test.go:25:16: undefined: ValidParentheses
./kata_test.go:26:16: undefined: ValidParentheses
./kata_test.go:26:16: too many errors