کُلُّ is a noun that will be a first term of Idaafa and could mean "every/each" if it is followed by a singular indefinite noun. If the singular noun is definite, کُلُّ would mean "all/whole". If it is used after a noun, then it should carry its corresponding pronoun suffix and its function becomes emphatic.
a. I read every book! قرأتُ کُلَّ کتابٍ.
b. I read the whole book. قرأتُ کُلَّ الکتابِ.
c. I read the book, all of it. قرأتُ الکتابَ کـُلـَّهُ
However, if ** کـُلُّ is followed by a plural noun, that noun should be definite and both create Idaafa. Check the following sentences:**
**حضرَ کلُّ الموظفينَ**
All the employees (m) came.
**حضرَ کلُّ موظفي المکتبِ.**
All the office employees (m) came.