Skript only work in certain world?

[bebeli555]

So i have multiple worlds on my server but id like this skript only to work on a world named "prisons" so how can i do that so the skript wouldnt affect the other worlds only work in the prisons world? Heres the skript:

on break of iron ore:
cancel event
set event-block to air
give 1 of iron ingot to player
make console execute "eco give %player% 0.8"

on break of gold ore:
cancel event
set event-block to air
give 1 of gold ingot to player
make console execute "eco give %player% 0.8"

on break of diamond ore:
cancel event
set event-block to air
give 1 of diamond to player
make console execute "eco give %player% 0.8"

on break of emerald ore:
cancel event
set event-block to air
give 1 of emerald to player
make console execute "eco give %player% 0.8"

on break of coal ore:
cancel event
set event-block to air
give 1 of coal to player
make console execute "eco give %player% 0.8"

on break of stone:
cancel event
set event-block to air

 

[Famix]

just add
if event-world is "prison":

 

[bebeli555]

just add
if event-world is "prison":

Where do i add that in the skript? i tried but it says cannot understand this line.

 

[Blue]

For example,

on break of iron ore:
  event-world is "prisons" #this is an in-line condition
  cancel event
  set event-block to air
  give 1 of iron ingot to player
  add 0.8 to balance of player #you don't need to use console commands if you have Vault installed; Skript supports Vault-based Economy plugins