diff --git a/src/main/kotlin/ru/otus/homework/functions.kt b/src/main/kotlin/ru/otus/homework/functions.kt
index 4a7fe1e..198649f 100644
--- a/src/main/kotlin/ru/otus/homework/functions.kt
+++ b/src/main/kotlin/ru/otus/homework/functions.kt
@@ -3,78 +3,35 @@ package ru.otus.homework
 import java.time.LocalDate
 
 fun main() {
-    println(calculate(10, 20))
-    println(calculate(10, 20.5F))
-    println(calculate(30.1F, 40.2F, 50.3F, 60.4F))
 
-    println(calculate(3, 2, ::add))
-    println(calculate(3, 2, ::subtract))
-    println(calculate(3, 2) { n1, n2 -> n1 * n2 })
+    println(sumInts(1, 2, 3, 4))
 
-    sign(
-        lastName = "Иванов",
-        firstName = "Вася"
-    )
+    println(joinStrings("Hello", "World"))
+    println(joinStrings("Hello", "World", separator = ','))
 
-    translate(calculate(1.1F, 2.2F, 3.3F)) {
-        "In english: ${it.replace("+", "plus").replace("=", "equals")}"
+    val time = measureExecutionTime {
+        for (i in 1..1000000) { }
     }
-    println(
-        calculate(1.1F, 2.2F, 3.3F) {
-            "%.4f (с точностью до четырех знаков)".format(this)
-        }
-    )
 
-    val product = 2 by 2
-    println("Произведение: $product")
-}
-
-infix fun Int.by(other: Int): Int = this * other
-
-fun translate(what: String, translator: (String) -> String) {
-    println(translator(what))
-}
+    println("Execution time: $time ms")
 
-fun sign(firstName: String, lastName: String, date: LocalDate = LocalDate.now()) {
-    println("Работу выполнил: $firstName $lastName, ${date.russian()}")
 }
 
-internal fun LocalDate.russian(): String {
-    return "${this.dayOfMonth}.${monthValue}.${year}"
-}
-
-fun what(): String = "Огурцов"
-
-fun calculate(n1: Int, n2: Int): String = "$n1 + $n2 = ${ n1 + n2 } ${ what() }"
-
-fun calculate(n1: Int, n2: Float): String {
-    fun add(): String {
-        val s: Float
-
-        while (true) {
-            // Пример блока. Вычисляем, и сразу выходим
-            val s1 = n1 + n2
-            s = s1
-            break
-        }
-
-        return "$n1 + $n2 = $s"
+fun sumInts(n1: Int, n2: Int, vararg others: Int): Int {
+    var sum = n1 + n2
+    for (n in others) {
+        sum += n
     }
-    return "${ add() } ${ what() }"
-}
-
-fun Float.formatWithDot(): String = "%.2f".format(this)
-
-fun calculate(vararg n: Float, format: Float.() -> String = Float::formatWithDot): String {
-    var sum = 0F
-    n.forEach { sum += it }
-    return "${n.joinToString(" + ")} = ${sum.format()}"
+    return sum
 }
 
-fun calculate(n1: Int, n2: Int, op: (Int, Int) -> Int): String {
-    val result = op(n1, n2)
-    return "Результат операции $n1 и $n2 равен: $result"
+fun joinStrings(vararg strings: String, separator: Char = ' '): String {
+    return strings.joinToString(separator.toString())
 }
 
-fun add(a: Int, b: Int): Int = a + b
-fun subtract(a: Int, b: Int): Int = a - b
+fun measureExecutionTime(block: () -> Unit): Long {
+    val start = System.currentTimeMillis()
+    block()
+    val end = System.currentTimeMillis()
+    return end - start
+}
\ No newline at end of file
diff --git a/src/test/kotlin/ru/otus/homework/FunctionsTest.kt b/src/test/kotlin/ru/otus/homework/FunctionsTest.kt
index 93a36cf..3e43d46 100644
--- a/src/test/kotlin/ru/otus/homework/FunctionsTest.kt
+++ b/src/test/kotlin/ru/otus/homework/FunctionsTest.kt
@@ -1,14 +1,26 @@
+
 package ru.otus.homework
 
 import org.junit.jupiter.api.Assertions
 import org.junit.jupiter.api.Test
 
 class FunctionsTest {
+
     @Test
-    fun calculationTest() {
+    fun joinStringsTest() {
+
+        val str1 = "str1"
+        val str2 = "str2"
+        val str3 = "str3"
+
+        Assertions.assertEquals(
+            "str1 str2 str3",
+            joinStrings(str1, str2, str3)
+        )
+
         Assertions.assertEquals(
-            "1 + 2 = 3 Огурцов",
-            calculate(1, 2)
+            "str1,str2,str3",
+            joinStrings(str1, str2, str3, separator = ',')
         )
     }
 }
\ No newline at end of file