make single function to effect crypto server side

Sources/epoch_server/compile/epoch_trading/EPOCH_server_effectCrypto.sqf

@@ -0,0 +1,44 @@
+/*
+	Author: Aaron Clark - EpochMod.com
+
+    Contributors:
+
+	Description:
+    Epoch Mod - Server side effect crypto main function
+
+    Licence:
+    Arma Public License Share Alike (APL-SA) - https://www.bistudio.com/community/licenses/arma-public-license-share-alike
+
+    Github:
+    https://github.com/EpochModTeam/Epoch/tree/master/Sources/epoch_server/compile/epoch_trading/EPOCH_server_effectCrypto.sqf
+
+	Example:
+    [_player,100] call EPOCH_server_effectCrypto; // adds 100
+    [_player,-100] call EPOCH_server_effectCrypto; // removes 100
+
+    Parameter(s):
+		_this select 0: OBJECT - player
+        _this select 1: NUMBER - amount to add to existing crypto
+	Returns:
+	MIXED
+*/
+private ["_cIndex","_vars","_current_crypto"];
+params [["_player",objNull,[objNull]],["_crypto",0,[0]]];
+if (!isNull _player && isPlayer _player) then {
+	// get index of custom variable
+	_cIndex = EPOCH_customVars find "Crypto";
+	// get custom variables
+	_vars = _player getVariable["VARS", call EPOCH_defaultVars_SEPXVar];
+	// select current value
+	_current_crypto = _vars select _cIndex;
+	// get min and max limits for selected custom variable
+	(EPOCH_customVarLimits select _cIndex) params ["_playerCryptoLimitMax","_playerCryptoLimitMin"];
+	// add input number to existing variable while keeping it within min and max range.
+	_current_crypto = ((_current_crypto + _crypto) min _playerCryptoLimitMax) max _playerCryptoLimitMin;
+	// send final value back to the player
+	_current_crypto remoteExec ['EPOCH_effectCrypto',_player];
+	// set final variable
+	_vars set[_cIndex, _current_crypto];
+	// save modified custom variables array
+	_player setVariable["VARS", _vars];
+};

Sources/epoch_server/config.cpp

@@ -85,6 +85,7 @@ class CfgServerFunctions
 			class server_spawnTraders {};
 		};
 		class epoch_trading {
+			class server_effectCrypto {};
 			class server_makeTrade {};
 			class server_tradeRequest {};
 			class server_makeNPCTrade {};