First of all, an if-elif-else-fi that queries one variable (here: $1) can be more efficiently done by a case-;;-;;-esac.
Then, if the following code is similar enough for each condition, it is...
Without fully understanding what going on here, the first thing to do would be drop the double quotes around $liste_rep in the first for loop, and replace $liste_rep with $rep in the second. Try that...