Don't touch anything in the cromchat.inc file. Use the "CC_SetPrefix" function or pass the value directly in the "CC_PREFIX" variable.
Code:
public plugin_init()
{
g_pCvarPrefix = register_cvar("bb_shop_prefix", "[BaseBuilderShop]")
}
public plugin_cfg()
{
get_pcvar_string(g_pCvarPrefix, CC_PREFIX, charsmax(CC_PREFIX))
}