Should money in bank account be shown in amount of total sundry debtors

No . money in bank account shown as cash in bank. Not as of total of sundry debtors

No ... make a cash account for the year which you are filing return i.e. all the transactions done by you in cash which includes deposit in bank and cash withdrawn from bank as well and any other cash transactions made by you . The balance cash you have in hand on 31 March will come in that "Amount Of Cash Balance "

Also remember to take opening cash balance

However you can also put some estimated amount in lump sum as cash balance also if you are unable to make cash account