1997 Ford Mustang clutch

Check the clutch fluid. If it's low then there's a leak and you'll need to check the slave cylinder on the transmission and the master cylinder on the firewall for wetness. Don't forget the lines and hoses also if there's no wetness on the cylinders. If it's not low then have someone push in the pedal while you watch the slave push the fork on the transmission. If it doesn't move then the master or slave or both are bad. If it pushes the fork but still no clutch then there's a failure with the clutch inside the transmission