June 2018 Update

Task/Find-common-directory-path/Kotlin/find-common-directory-path.kotlin

@@ -0,0 +1,28 @@
+// version 1.1.51
+
+fun findCommonDirPath(paths: List<String>, separator: Char): String {
+    if (paths.isEmpty()) return ""
+    if (paths.size == 1) return paths[0]
+    val splits = paths[0].split(separator)
+    val n = splits.size
+    val paths2 = paths.drop(1)
+    var k = 0
+    var common = ""
+    while (true) {
+        val prevCommon = common
+        common += if (k == 0) splits[0] else separator + splits[k]
+        if (!paths2.all { it.startsWith(common + separator) || it == common } ) return prevCommon
+        if (++k == n) return common
+    }
+}
+
+fun main(args: Array<String>) {
+    val paths = listOf(
+        "/home/user1/tmp/coverage/test",
+        "/home/user1/tmp/covert/operator",
+        "/home/user1/tmp/coven/members"
+    )
+    val pathsToPrint = paths.map { "   '$it'" }.joinToString("\n")
+    println("The common directory path of:\n\n$pathsToPrint\n")
+    println("is '${findCommonDirPath(paths, '/')}'")
+}