Add compute rate

src/main/kotlin/com/cubetiqs/libra/moneyutils/Money.kt

@@ -1,26 +1,23 @@
 package com.cubetiqs.libra.moneyutils
 
 open class Money(
-    private var value: Double,
-    private var currency: String = "USD"
+    var value: Double,
+    var currency: String = "USD"
 ) : StdMoney {
-    override fun getValue(): Double {
+
+    //////////////////// - PROPERTIES - ////////////////////
+
+    override fun getMoneyValue(): Double {
         return this.value
     }
 
-    fun setValue(value: Double) {
-        this.value = value
-    }
-
-    override fun getCurrency(): String {
+    override fun getMoneyCurrency(): String {
         return this.currency.toUpperCase()
     }
 
-    fun setCurrency(currency: String) {
-        this.currency = currency
-    }
+    //////////////////// - GENERIC - ////////////////////
 
     override fun toString(): String {
-        return "Money(value=${getValue()}, currency='${getCurrency()}')"
+        return "Money(value=${getMoneyValue()}, currency='${getMoneyCurrency()}')"
     }
 }

src/main/kotlin/com/cubetiqs/libra/moneyutils/MoneyExchangeUtils.kt

@@ -0,0 +1,7 @@
+package com.cubetiqs.libra.moneyutils
+
+object MoneyExchangeUtils {
+    fun computeRate(rateFrom: Double, rateTo: Double, baseRate: Double = 1.0, amountFrom: Double = 1.0): Double {
+        return amountFrom * ((baseRate / rateFrom) / (baseRate / rateTo))
+    }
+}

src/main/kotlin/com/cubetiqs/libra/moneyutils/MoneyOperator.kt

@@ -1,7 +1,7 @@
 package com.cubetiqs.libra.moneyutils
 
-operator fun Money.unaryMinus() = (-value)
-operator fun Money.unaryPlus() = (+value)
+operator fun Money.unaryMinus() = (-getMoneyValue())
+operator fun Money.unaryPlus() = (+getMoneyValue())
 operator fun Money.inc() = Money(value++)
 operator fun Money.dec() = Money(value--)
 operator fun Money.plus(other: Money) = Money(value + other.value)

src/main/kotlin/com/cubetiqs/libra/moneyutils/StdMoney.kt

@@ -13,12 +13,12 @@ interface StdMoney {
      *
      * @return Double
      */
-    fun getValue(): Double
+    fun getMoneyValue(): Double
 
     /**
      * Get money's currency from current state.
      *
      * @return String
      */
-    fun getCurrency(): String
+    fun getMoneyCurrency(): String
 }