Remove obsolete files, move test files in tests folder

go/benchmark.sh

@@ -1,12 +0,0 @@
-#!/bin/sh
-
-set -o errexit
-set -o pipefail
-IFS='
-'
-
-cd -P "$(dirname "$0")"
-
-./clean.sh
-cp -a solutions student
-go test -v -json|jq -c 'select(.Action == "pass") | {Test, Elapsed}' | jq -sr 'sort_by(.Elapsed) | .[-30:] | .[] | [.Elapsed, .Test] | @tsv'

go/clean.sh

@@ -1,10 +0,0 @@
-#!/bin/sh
-
-set -o errexit
-set -o pipefail
-IFS='
-'
-
-cd -P "$(dirname "$0")"
-
-find . -type f -executable ! -name '*.sh' -delete