update book code

eBook/exercises/chapter_7/uniq.go

@@ -0,0 +1,23 @@
+// Q29_uniq.go
+package main
+
+import (
+	"fmt"
+)
+
+var arr []byte = []byte{'a','b','a','a','a','c','d','e','f','g'}
+
+func main() {
+	arru := make([]byte,len(arr)) // this will contain the unique items
+	ixu := 0 // index in arru
+	tmp := byte(0)
+	for _, val := range arr {
+		if val!=tmp {
+			arru[ixu] = val
+			fmt.Printf("%c ", arru[ixu])	
+			ixu++
+		}
+		tmp = val
+	}
+	// fmt.Println(arru)
+}