You have a leaky clutch master cylinder, or a leaky brake master cylinder.
The fix to to find out which one is leaking and to replace it. The new fluid will need bleeding out at the slave cylinder, but first pull back the rubber boot on the end of the slave cylinder (assuming it's the clutch). If there is fluid there as well, the the slave cylinder must also be replaced. if it's the break master cylinder, then you'll need to check the seals on the rear wheel brake cylinders and the front wheel caliper pistons. If any leak, they must be replaced.
If you're an experienced mechanic (your question suggests not) then you may be able to dismantle, assess, and if appropriate rebuild any leaky parts using new seals/pistons. The parts are usually cheap, but the very high labour costs and higher chances of a post-repair fault mean that most garages just replace the entire assembly with new and guaranteed parts as it's far quicker, easier and less likely to come back for remedial work.
BTW: the fault is always caused by either poor maintenance (brake/clutch fluid must be periodically replaced to prevent this fault) or by someone accidentally getting oil, grease or incompatible LHM fluid into the master cylinder (they all destroy the seals). if there had been a fault from new, it would have failed a long time ago.
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