This is just Cleaning Company mod but only the code for selling enemies dead bodies.
Original author of the mod: https://thunderstore.io/c/lethal-company/p/malco/SellBodies/

V 1.2.1:

• Fixed all issues caused by only making the original body mesh invisible.
• Changed how the Nutcracker shotgun spawns.

Known Issues

• Bodies do not spawn with the correct rotation relative to the original body.

V 1.2.0:

• The Nutcracker has been reintroduced.
• Enemies should now have a death animation before being turned into collectible bodies.
• Fixed a bug where the Nutcracker shotgun would appear at the initial spawn location of the Nutcracker after its death.
• Fixed a bug where the Nutcracker would not drop ammunition upon death.
• Fixed a bug where the Spider webs would remain indestructible after the Spider death.

V 1.1.0:

• Changed the model of the Bracken remains.
• Changed the position of the Thumper's body when carrying it. This should fix the body drop position (previously it was dropped too far to the left).

V 1.0.1:

• Fixed a bug where the mod tried to load the Nutcracker body.

V 1.0.0:

• Fixed the Baboon Hawk bugged price.
• Removed Nutcracker body due to issues with shotgun and shells drop.

In the config you can change the amount of credits the bodies are worth, the weight of the bodies, and what mobs can or can't be sold.

SellBodiesFixed Changelog

V 1.10.1:

• Change Confetti code to make sure the "Cheer" sound and "Yippee" sound are only played once when a mob is killed.

V 1.10.0:

• Added the body for the Maneater.
• Improved the V1.9.9 fix.

V 1.9.9:

• Fixed an issue that would cause console spam if a player instantly picked up a body while it was still finishing "spawning".

V 1.9.8:

• I accidentally broke the mod with the latest update, mb and sorry.

V 1.9.7:

• Added some checks to make sure the "Cheer" sound and "Yippee" sound are only played once when a mob is killed.

V 1.9.6:

• Fixed an issue where the "Cheer" sound the and "Yippee" sound would cause an error that would make creatures immortal.

V 1.9.5:

• Confetti can now be enabled from config (disabled by default).
• Added a config to replace the "cheer" sound with "yippee" one (disabled by default).
• Potential fix for an issue that would cause console spam if a player instantly picked up a body while it was still finishing "spawning".

V 1.9.4:

• I hope you like confetti (1M downloads update).

V 1.9.3:

• Small Bug Fix for Lethal Company Variables compatibility.

V 1.9.2:

• Fix for rideable enemies.

V 1.9.1:

• By popular demand, changed the Eyeless Dog drop. The Eyeless Dog now drops its teeth (the drop stats are the same as the old drop/body).

V 1.9.0:

• Added a drop for the Barber.
• Added a drop for the Kidnapper Fox.
• Changed the Eyeless Dog's body hitbox to be more accurate and less intrusive.
• changed some names in config (I suggest to delete the old config file to regenerate them).

V 1.8.9:

• Reverted Version 1.8.8 of the mod.

V 1.8.8:

• Fixed an issue created with the last patch that caused the price of all shotguns to be 0.

V 1.8.7:

• The price of the shotgun should be the same as the one originally held by the Nutcracker.

V 1.8.6:

• I hope i managed to fix the problem of the original bodies not disappearing correctly (I'm going crazy because of this problem).

V 1.8.5:

• Shotgun spawn with the correct rotation after the Nutcracker has been killed.

V 1.8.4:

• Bodies spawn with the correct rotation after the enemy has been killed.

V 1.8.3:

• Replaced the compatibility system, implemented for other mods, added in version 1.8.2.
• Removed redundant functions from the code.
• (Hopefully for the last time) Fixed an issue where the original enemy bodies could remain visible for some players (Update: apparently it didn't work).

V 1.8.2:

• Increased compatibility with other mods.

V 1.8.1:

• Fixed the config name for the Tulip Snake body weight.

V 1.8.0:

• Added Tulip Snake body.
• Changed Manticoil body name.

V 1.7.2:

• Fixed an issue where bodies/remains of modded enemy would not spawn.

V 1.7.1:

• Fixed an issue where the original enemy body would not disappear if it was killed by a client and not the server.

V 1.7.0:

• The mod supports v50 of the game.
• Added bodies for the Manticoil and RadMech.
• Fixed an issue with Scan Nodes on some bodies.

V 1.6.0:

• Now even unkillable enemies in vanilla have drops.
• Modded enemies now drop remains whose value varies based on the spawn weight of the killed enemy.
• Added the ability to configure whether a body/drop is one-handed or two-handed.
• Fixed an issue with Scan Nodes on some bodies.
• Changed the structure of the config file (It is advisable to delete and regenerate the config file).

V 1.5.0:

• Now the value of the bodies has a multiplier that varies based on the "Maximum Power" of the moons (see the wiki).
• Added config to change the multiplier.
• Code optimization.

V 1.4.1:

• Dependencies update.

V 1.4.0:

• Finally fixed the issue where the value of the bodies was not synced with the host.
• Now shotguns also have the value synced with the host.

V 1.3.0:

• Added a custom icon for bodies when held.
• Changed the position in which the Thumper's body spawns.

V 1.2.2:

• Small changes to the code, nothing should have changed in terms of gameplay.

V 1.2.1:

• Fixed all issues caused by only making the original body mesh invisible.
• Changed how the Nutcracker shotgun spawns.

V 1.2.0:

• The Nutcracker body has been reintroduced.
• Enemies should now have a death animation before being turned into collectible bodies.
• Fixed a bug where the Nutcracker shotgun would appear at the initial spawn location of the Nutcracker after its death.
• Fixed a bug where the Nutcracker would not drop ammunition upon death.
• Fixed a bug where the Spider webs would remain indestructible after the Spider death.

V 1.1.0:

• Changed the model of the Bracken remains.
• Changed the position of the Thumper's body when carrying it. This should fix the body drop position (previously it was dropped too far to the left).

V 1.0.1:

• Fixed a bug where the mod tried to load the Nutcracker body.

V 1.0.0:

• Fixed the Baboon Hawk body bugged price.
• Removed Nutcracker body due to issues with shotgun and shells drop.