[KTLN-673] Parse String with thousands separator in Kotlin (#877)

* added unit tests

* code fixes

* code fixes

* code fixes

* code fixes

* code fixes

Author: albertache1998

core-kotlin-modules/core-kotlin-strings-5/src/test/kotlin/thousandsSeparator/ParseStringWithThousandsSeparator.kt

@@ -0,0 +1,58 @@
+package thousandsSeparator
+
+import org.junit.jupiter.api.Test
+import java.text.DecimalFormatSymbols
+import java.text.NumberFormat
+import java.util.*
+import kotlin.test.assertEquals
+
+class ParseStringWithThousandsSeparator {
+
+    @Test
+    fun `parses string with thousands separator using replace method`(){
+        val result1 = parseStringUsingReplace("1,000", Locale.US)
+        val result2 = parseStringUsingReplace("25.750", Locale.GERMAN)
+
+        assertEquals(1000, result1)
+        assertEquals(25750, result2)
+    }
+
+    @Test
+    fun `parses string with thousands separator using number format class`(){
+        val result1 = parseStringWithSeparatorUsingNumberFormat("1,000", Locale.US)
+        val result2 = parseStringWithSeparatorUsingNumberFormat("25.750", Locale.GERMAN)
+
+        assertEquals(1000, result1)
+        assertEquals(25750, result2)
+    }
+
+    @Test
+    fun `parses string with thousands separator using string tokenizer`(){
+        val result1 = parseStringUsingTokenizer("1,000", Locale.US)
+        val result2 = parseStringUsingTokenizer("25.750", Locale.GERMAN)
+
+        assertEquals(1000, result1)
+        assertEquals(25750, result2)
+    }
+}
+
+fun parseStringUsingReplace(input: String, locale: Locale): Int {
+    val separator = DecimalFormatSymbols.getInstance(locale).groupingSeparator
+    return input.replace(Regex("[$separator]"), "").toInt()
+}
+
+fun parseStringWithSeparatorUsingNumberFormat(input: String, locale: Locale): Int {
+    val number = NumberFormat.getInstance(locale)
+    val num = number.parse(input)
+    return num.toInt()
+}
+
+fun parseStringUsingTokenizer(input: String, locale: Locale): Int {
+    val separator = DecimalFormatSymbols.getInstance(locale).groupingSeparator
+    val tokenizer = StringTokenizer(input, separator.toString())
+    val builder = StringBuilder()
+    while (tokenizer.hasMoreTokens()) {
+        builder.append(tokenizer.nextToken())
+    }
+    return builder.toString().toInt()
+}