script strip ":" at mac address

RouterOS Scripting
1

dear all

i create script for simple strip “:” from mac address at dhcp lease
:global leaseActMAC
:for i from=0 to=([:len $leaseActMAC] - 1) do={
:local char [:pick $leaseActMAC $i]
:if ($char = “:”) do={
:put [set $char “”]
}
}
but doest work please guide me