CLEO Help help with cleo script

[Domantas]

hey i have big problem with another script.i have no idea how to edit this but, i want that this script would write only a part of nickname .Example: not /vaziuoju Joseph_John
but /vaziuoju josep . how to do that? i tried everything nothing seems to work
everytime i change ''%s'' samp crashes

i only see this ''%s'' how to make this script write shorter and with lowercase letters?

 

[WaTTi]

// Fuck_WaTTi
0B36: samp 0@ = get_player_nickname 1@
0C2A: 2@ = strchr 0@ char "_"
0C24: strncpy destination 3@ source 0@ size 2@
// result = Fuck

idk if works

 

[Domantas]

// Fuck_WaTTi
0B36: samp 0@ = get_player_nickname 1@
0C2A: 2@ = strchr 0@ char "_"
0C24: strncpy destination 3@ source 0@ size 2@
// result = Fuck

idk if works

im putting the code wrong or i dont know something, put it for me and add attachment pls