Fixed code styling.

tools/lint

@@ -1,3 +1,4 @@
 #!/usr/bin/env bash
-
-find ${PROJECT_ROOT}/src -name '*.rs' | xargs rustfmt --edition 2021
+echo "Linting code"
+export src_dir=`dirname ${DIRENV_FILE}`
+find ${src_dir}/src -name '*.rs' | xargs rustfmt --edition 2021