Implement makeAbbr() 🔠✂️

Author: Volodymyr-Mykychak

src/main/kotlin/mate/academy/MakeAbbreviation.kt

@@ -1,6 +1,10 @@
 package mate.academy
 
-fun makeAbbr(source: String) : String {
-    // implement this function
-    return ""
+fun makeAbbr(source: String): String {
+
+    return source
+        .split(" ")
+        .filter { it.isNotEmpty() }
+        .map { it[0].uppercaseChar() }
+        .joinToString("")
 }