feat: restructure code; add size and ext checks (#39)

- Refractor code
- Add file size and extension checkers
- Change repair workflow to use zurg

internal/utils/misc.go

@@ -0,0 +1,15 @@
+package utils
+
+func RemoveItem[S ~[]E, E comparable](s S, values ...E) S {
+	result := make(S, 0, len(s))
+outer:
+	for _, item := range s {
+		for _, v := range values {
+			if item == v {
+				continue outer
+			}
+		}
+		result = append(result, item)
+	}
+	return result
+}