(new): tgfmt package

(fix): formatting helpers
(ci/cd): go checks
(tests): tgfmt coverage

tgfmt/utils.go

@@ -0,0 +1,12 @@
+package tgfmt
+
+import "strings"
+
+// EscapePunctuation escapes '.', '!' and '-' for MarkdownV2 fragments.
+func EscapePunctuation(s string) string {
+	symbols := []string{".", "!", "-"}
+	for _, symbol := range symbols {
+		s = strings.ReplaceAll(s, symbol, "\\"+symbol)
+	}
+	return s
+}