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I need some hint on this one, Hint for لك Rule.

1. لَوْنَكَ
2. الشوكولاته الخاصة بك = chocolate for you
شوكولاتك = Your chocolate
** Not so sure about the spelling for chocolate

In English the possession pronoun proceed the thing you are talking about
let it be a book
in English you say your- book
in Arabic you mention the 'thing' ...like the book here
then you attache the possession pronoun to it
thus the expression your book becomes one word in arabic
كــتابــــ ــك
كتابك
kitabok
so the letter ك here works as morpheme , just like the english morphemes that can be attached to the english words ...see below examples
teach .....teacher
start ....restart
read .... reading
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what you need to know to that also
the same arabic morpheme ك
is used in this way
in english we used your + book
what about I see + you
in arabic see = أرى
I see you
will be
أنا أرا ك
أنا اراك
I think it is clear now
just keep in mind that you can recognize when the arabic ك
comes in the meaning of /your/ ??? in words that are nouns
and whenever it is attached to verb it is not /your/
it is a verb+you
.====================
Your color لونُك
ما هو لونك المفضل؟
what is your favorite color?
Your chocolate.
this is special case for chocolate isn't an Arabic word in its original
here we use /your piece of chocolate/
and even with the help of using piece
we need to add الخاصة بك = that belongs to you
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In all cases I am not going to give you some of my chocolate becoz i have eaten it !
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As for لك
it is = for + you

Clear?

Possessive pronouns in Arabic :

Book : كتاب Kitaab

First person ::
my : ي "ee" example : My book : كتابي Kitaaby
Our : نا "naa" example : Our book : كتابنا Kitabunaa

Second person :
Your :
Masculine singular : ك "ka" example : كتابك Kitaabuka , your book
Feminine singular : ك "ki" example : كتابك Kitaabuki , your book
Masculine plural : كم "kom" example : كتابكم Kitaabukom , your book
Feminine plural : كن "kunna" example : كتابكن Kitaabukunna , your book

Third person :
His (Masculine singular) : ه "hu" example :كتابه Kitaabuhu , his book
Her (Feminine singular) : ها "ha" example :كتابها Kitaabuha , her book
Their (Masculine plural) : هم "hom" example :كتابهم Kitaabuhom , thier book
Their (Feminine plural) : هن "hunna" example :كتابهن Kitaabuhunna , their book

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But لك is a different thing
لك actually means "for you" or "yours" the Lam is "for" and the kaf is "you" so they are two parts. a preposition and a pronoun combined together.

so if you want to say the book is for me or the book is mine you can say :
الكتاب لي Al-kitaabu lee

if you want to say the book is for you or the book is yours you can say :
الكتاب لك Al-kitaabu laka (if you are talking to a singular masculine person)
الكتاب لك Al-kitaabu laki (if you are talking to a singular feminine person)
الكتاب لكم Al-kitaabu lakom (if you are talking to a group of men / boys)
الكتاب لكن Al-kitaabu lakunna (if you are talking to a group of women / girls)