scripts and styles

hi
the hammy-stylesheet-css are only few lines,
I would like to reduce http request and deregister this style

but how can I do this ??

function mtsmag_deregister_styles() {
wp_deregister_style( 'hammy-stylesheet-css' );

}
add_action( 'wp_print_styles', 'mtsmag_deregister_styles', 100 );

does’nt work

and a feature requests => the scripts are not minified
I did this by myself, but I know this is not the best way ??

https://www.ads-software.com/plugins/hammy/