async function playStone(col) {
            c4.setStone(col, function (error, result) {
                if (!error) {
                    //console.log(result);
                }
                else
                    console.error(error);
            });
        }
// try to play a stone in the specified column
try to play a stone in the specified column
try to play a stone in the specified column
async function playStone(col) {
            c4.setStone(col, function (error, result) {
                if (!error) {
                }
                else
                    console.error(error);
            });
        }
async function playStone ( col ) { c4 . setStone ( col , function ( error , result ) { if ( ! error ) { } else console . error ( error ) ; } ) ; }
try to play a stone in the specified column
try to play a stone in the specified column
//console.log(result);