Added guard in take/drop methods to ensure they exit when specifying …

…N > string length

strings_ext.go

@@ -43,7 +43,7 @@ func Tail(s string) string {
 
 //Take returns the n rune prefix of s or s itself if n > len([]rune(s))
 func Take(n int, s string) string {
-	if n <= 0 || s == "" {
+	if n <= 0 || s == "" || n > len(s) {
 		return ""
 	}
 
@@ -73,6 +73,8 @@ func Take(n int, s string) string {
 func Drop(n int, s string) string {
 	if n <= 0 || s == "" {
 		return s
+	} else if n > len(s) {
+		return ""
 	}
 
 	//TODO: Deal with rune encoding errors

strings_ext_test.go

@@ -133,7 +133,7 @@ func TestTakeWithOneChar(t *testing.T) {
 func TestTakeWithMoreThanStringLength(t *testing.T) {
 	var input string = "test"
 	var expected string = "test"
-	var actual string = Take(20, input)
+	var actual string = Take(500, input)
 
 	assert.Equal(t, len(actual), len(expected))
 	assert.Equal(t, actual, expected)