BAEL-838 Initial code showing how to remove last char - helper class and tests.

(cherry picked from commit d889dba)

core-java/src/main/java/com/baeldung/string/RemoveLastChar.java

@@ -0,0 +1,18 @@
+/**
+ * 
+ */
+package com.baeldung.string;
+
+/**
+ * @author iaforek
+ *
+ */
+public class RemoveLastChar {
+	public static String substring (String s) {
+		if (s == null || s.length() == 0) {
+			return null;
+		} else {
+			return (s.substring(0, s.length() - 1));
+		}
+	}
+}