diff --git a/src/main/kotlin/com/cubetiqs/libra/moneyutils/Money.kt b/src/main/kotlin/com/cubetiqs/libra/moneyutils/Money.kt
index a452b8e..30dfe34 100644
--- a/src/main/kotlin/com/cubetiqs/libra/moneyutils/Money.kt
+++ b/src/main/kotlin/com/cubetiqs/libra/moneyutils/Money.kt
@@ -2,7 +2,7 @@ package com.cubetiqs.libra.moneyutils
 
 open class Money(
     var value: Double,
-    private var currency: String = "USD"
+    @SpecialString(trim = true, upperCase = true) private var currency: String = "USD"
 ) : StdMoney {
 
     //////////////////// - PROPERTIES - ////////////////////
@@ -12,7 +12,7 @@ open class Money(
     }
 
     override fun getMoneyCurrency(): String {
-        return this.currency.toUpperCase()
+        return this.currency
     }
 
     //////////////////// - GENERIC - ////////////////////
diff --git a/src/main/kotlin/com/cubetiqs/libra/moneyutils/MoneyArithmetic.kt b/src/main/kotlin/com/cubetiqs/libra/moneyutils/MoneyArithmetic.kt
new file mode 100644
index 0000000..81c529d
--- /dev/null
+++ b/src/main/kotlin/com/cubetiqs/libra/moneyutils/MoneyArithmetic.kt
@@ -0,0 +1,5 @@
+package com.cubetiqs.libra.moneyutils
+
+fun StdMoney.addMoney(value: Double, currency: String): StdMoney {
+    return this + Money.create(value, currency)
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/cubetiqs/libra/moneyutils/MoneyExtension.kt b/src/main/kotlin/com/cubetiqs/libra/moneyutils/MoneyExtension.kt
index 05caf96..12defd7 100644
--- a/src/main/kotlin/com/cubetiqs/libra/moneyutils/MoneyExtension.kt
+++ b/src/main/kotlin/com/cubetiqs/libra/moneyutils/MoneyExtension.kt
@@ -1,3 +1,7 @@
 package com.cubetiqs.libra.moneyutils
 
-fun StdMoney
\ No newline at end of file
+fun StdMoney.exchangeTo(currency: String): StdMoney {
+    return MoneyExchangeUtils.exchange(this, currency)
+}
+
+fun StdMoney.isMatchedCurrency(currency: String) = this.getMoneyCurrency().equals(currency, ignoreCase = true)
\ No newline at end of file
diff --git a/src/main/kotlin/com/cubetiqs/libra/moneyutils/SpecialString.kt b/src/main/kotlin/com/cubetiqs/libra/moneyutils/SpecialString.kt
new file mode 100644
index 0000000..3b4b644
--- /dev/null
+++ b/src/main/kotlin/com/cubetiqs/libra/moneyutils/SpecialString.kt
@@ -0,0 +1,5 @@
+package com.cubetiqs.libra.moneyutils
+
+@Target(AnnotationTarget.FIELD)
+@Retention(AnnotationRetention.RUNTIME)
+annotation class SpecialString(val value: String = "", val upperCase: Boolean = true, val trim: Boolean = true)
\ No newline at end of file
diff --git a/src/main/kotlin/com/cubetiqs/libra/moneyutils/SpecialStringProcessor.kt b/src/main/kotlin/com/cubetiqs/libra/moneyutils/SpecialStringProcessor.kt
new file mode 100644
index 0000000..b33652b
--- /dev/null
+++ b/src/main/kotlin/com/cubetiqs/libra/moneyutils/SpecialStringProcessor.kt
@@ -0,0 +1,37 @@
+package com.cubetiqs.libra.moneyutils
+
+import java.lang.reflect.Field
+
+class SpecialStringProcessor: ISerializer {
+    override fun <T> serialize(data: T?): T? {
+        if (data == null) return null
+        val clazz = data.javaClass
+        clazz.declaredFields.forEach {
+            it.isAccessible = true
+            if (it.isAnnotationPresent(SpecialString::class.java) && it.genericType == String::class.java) {
+                val annotationValues = it.getAnnotation(SpecialString::class.java)
+                var value = it.get(data).toString()
+                if (annotationValues.trim) {
+                    value = value.trim()
+                }
+                if (annotationValues.upperCase) {
+                    value = value.toUpperCase()
+                }
+                it.set(data, value)
+            }
+        }
+
+        return data
+    }
+
+    private fun getSerializeKey(field: Field): String {
+        val annotationValue = field.getAnnotation(SpecialString::class.java).value
+        return if (annotationValue.isEmpty()) {
+            field.name
+        } else annotationValue
+    }
+}
+
+interface ISerializer {
+    fun <T> serialize(data: T?): T?
+}
\ No newline at end of file
diff --git a/src/main/kotlin/com/cubetiqs/libra/moneyutils/StdMoney.kt b/src/main/kotlin/com/cubetiqs/libra/moneyutils/StdMoney.kt
index 81ed748..e000a4e 100644
--- a/src/main/kotlin/com/cubetiqs/libra/moneyutils/StdMoney.kt
+++ b/src/main/kotlin/com/cubetiqs/libra/moneyutils/StdMoney.kt
@@ -20,5 +20,6 @@ interface StdMoney {
      *
      * @return String
      */
+    @SpecialString
     fun getMoneyCurrency(): String
 }
\ No newline at end of file
diff --git a/src/test/kotlin/MoneyTests.kt b/src/test/kotlin/MoneyTests.kt
index f9991c4..475c150 100644
--- a/src/test/kotlin/MoneyTests.kt
+++ b/src/test/kotlin/MoneyTests.kt
@@ -2,20 +2,21 @@ import com.cubetiqs.libra.moneyutils.Money
 import com.cubetiqs.libra.moneyutils.MoneyConfig
 import com.cubetiqs.libra.moneyutils.MoneyCurrency
 import com.cubetiqs.libra.moneyutils.MoneyExchangeUtils
-import com.cubetiqs.libra.moneyutils.plus
-import com.cubetiqs.libra.moneyutils.times
-import com.cubetiqs.libra.moneyutils.timesAssign
+import com.cubetiqs.libra.moneyutils.SpecialStringProcessor
 import org.junit.Assert
 import org.junit.Test
 
 class MoneyTests {
     @Test
     fun money_operator_test() {
-        val money = Money(10.0)
-        val money2 = Money(20.0)
-        money *= money
-        println((money + money2) * money2)
-        Assert.assertEquals(100.0, money.value, 0.0)
+        // val money = Money(10.0)
+        // val money2 = Money(20.0)
+        // money *= money
+        // println((money + money2) * money2)
+        // Assert.assertEquals(100.0, money.value, 0.0)
+
+        val test = SpecialStringProcessor().serialize(Money(1.0, "  usd   "))
+        println(test)
     }
 
     @Test
@@ -47,7 +48,7 @@ class MoneyTests {
             .setDeliEqual('=')
             .setDeliSplit(';')
 
-        MoneyConfig.parse("USD=1,KHR=4000,EUR=0.99")
+        MoneyConfig.parse("USD:1,KHR=4000,EUR=0.99")
 
         val moneyUsd = Money.ONE
         val moneyKhr = Money.create(20000.0, MoneyCurrency.KHR)
diff --git a/src/test/kotlin/ObjectTests.kt b/src/test/kotlin/ObjectTests.kt
new file mode 100644
index 0000000..6ea44db
--- /dev/null
+++ b/src/test/kotlin/ObjectTests.kt
@@ -0,0 +1,37 @@
+import org.junit.Test
+
+class ObjectTests {
+
+    @Test
+    fun builder_object_test() {
+        val person = Person
+            .builder()
+            .name("Sambo Chea")
+            .id(10)
+            .build()
+
+        println(person)
+    }
+}
+
+data class Person(val id: Long? = null, val name: String? = null) {
+    companion object {
+        fun builder(): PersonBuilder {
+            return PersonBuilder()
+        }
+    }
+}
+
+class PersonBuilder {
+    private var id: Long? = null
+    private var name: String? = null
+
+    fun id(id: Long?) = apply { this.id = id }
+    fun name(name: String?) = apply { this.name = name }
+
+    fun build(): Person {
+        return Person(id, name)
+    }
+
+
+}
\ No newline at end of file