solves string compression

Author: anishLearnsToCode

src/StringCompression.java

@@ -0,0 +1,27 @@
+public class StringCompression {
+    public int compress(char[] array) {
+        if (array.length == 0) return 0;
+
+        StringBuilder accumulator = new StringBuilder();
+        char current = array[0];
+        int count = 1;
+        for (int index = 1 ; index < array.length ; index++) {
+            if (array[index] == current) {
+                count++;
+            } else {
+                accumulator.append(current).append(count > 1 ? count : "");
+                current = array[index];
+                count = 1;
+            }
+        }
+        accumulator.append(current).append(count > 1 ? count : "");
+        copyInto(array, accumulator);
+        return accumulator.length();
+    }
+
+    private void copyInto(char[] array, StringBuilder buffer) {
+        for (int index = 0 ; index < buffer.length() ; index++) {
+            array[index] = buffer.charAt(index);
+        }
+    }
+}