quizes_total{} 1: Why "make check" will never detect any formatting errors?

Makefile

.DEFAULT_GOAL := fmt
MD_FILES_TO_FORMAT=$(shell find . -name "*.md")

.PHONY: fmt
fmt: ## Format docs.
fmt:
	@echo "Formatting markdown files..."
	# <command that correctly formats $(MD_FILES_TO_FORMAT) files>

.PHONY: check
check: ## Checks if doc is formatter and links are correct (don't check external links).
check:
	@echo "Checking markdown files. If changes are detected, try running `make` and trying again."
	# <command that exit 1 if $(MD_FILES_TO_FORMAT) files are not formatted>