Add ch-2 in Go

1 files changed, 93 insertions, 0 deletions

diff --git a/challenge-341/spadacciniweb/go/ch-2.go b/challenge-341/spadacciniweb/go/ch-2.go
new file mode 100644
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+++ b/challenge-341/spadacciniweb/go/ch-2.go
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+/*
+Task 2: Reverse Prefix
+Submitted by: Mohammad Sajid Anwar
+
+You are given a string, $str and a character in the given string, $char.
+Write a script to reverse the prefix upto the first occurrence of the given $char in the given string $str and return the new string.
+
+Example 1
+Input: $str = "programming", $char = "g"
+Output: "gorpmming"
+
+Reverse of prefix "prog" is "gorp".
+
+Example 2
+Input: $str = "hello", $char = "h"
+Output: "hello"
+
+Example 3
+Input: $str = "abcdefghij", $char = "h"
+Output: "hgfedcbaj"
+
+Example 4
+Input: $str = "reverse", $char = "s"
+Output: "srevere"
+
+Example 5
+Input: $str = "perl", $char = "r"
+Output: "repl"
+*/
+
+package main
+
+import (
+  "fmt"
+)
+
+func reverse_array(arr []rune) []rune {
+    left := 0
+    right := len(arr) - 1
+    for left < right {
+        arr[left], arr[right] = arr[right], arr[left]
+        left++
+        right--
+    }
+    return arr
+}
+
+func reverse_prefix(str string, chars string) {
+    var str_new []rune
+    var c rune
+
+    for _, char := range chars {
+        c = char
+        break
+    }
+
+    for _, s := range str {
+        str_new = append(str_new, s)
+        if s == c {
+            reverse_array(str_new)
+            break
+        }
+    }
+
+    for _, s := range str[len(str_new):] {
+        str_new = append(str_new, s)
+    }
+
+    fmt.Printf("'%s' '%s' -> '%s'\n", string(str), string(chars), string(str_new))
+}
+
+
+func main() {
+    str := "programming"
+    char := "g"
+    reverse_prefix( str, char )
+
+    str = "hello"
+    char = "h"
+    reverse_prefix( str, char )
+
+    str = "abcdefghij"
+    char = "h"
+    reverse_prefix( str, char )
+
+    str = "reverse"
+    char = "s"
+    reverse_prefix( str, char )
+
+    str = "perl"
+    char = "r"
+    reverse_prefix( str, char )
+}