Corretions and refinements to the String examples

build/linux/work/examples/08.Strings/StringSubstring/StringSubstring.ino

@@ -0,0 +1,41 @@
+/*
+  String substring()
+ 
+ Examples of how to use substring in a String
+ 
+ created 27 July 2010, 
+ modified 2 Apr 2012
+ by Zach Eveland
+ 
+ http://arduino.cc/en/Tutorial/StringSubstring
+ 
+ This example code is in the public domain.
+ */
+
+void setup() {
+  // Open serial communications and wait for port to open:
+  Serial.begin(9600);
+  // this check is only needed on the Leonardo:
+  while (!Serial) ;
+  ;
+
+  Serial.println("\n\nString  substring():");
+}
+
+void loop() {
+  // Set up a String:
+  String stringOne = "Content-Type: text/html";
+  Serial.println(stringOne);
+
+  // substring(index) looks for the substring from the index position to the end:
+  if (stringOne.substring(19) == "html") {
+    Serial.println("It's an html file"); 
+  } 
+  // you can also look for a substring in the middle of a string:
+  if (stringOne.substring(14,18) == "text") {
+    Serial.println("It's a text-based file"); 
+  } 
+
+  // do nothing while true:
+  while(true);
+}