From da8c963b7ab5da8cc25f04492503514614a407e0 Mon Sep 17 00:00:00 2001
From: Andreas Schulte <andreas.schulte@0x0001f346.de>
Date: Wed, 25 Oct 2023 22:48:39 +0200
Subject: [PATCH] + RemoveLeadingStrings

---
 strings.go      | 16 ++++++++++++++++
 strings_test.go | 34 +++++++++++++++++++++++++++++++++-
 2 files changed, 49 insertions(+), 1 deletion(-)

diff --git a/strings.go b/strings.go
index 14757fe..80bd6e5 100644
--- a/strings.go
+++ b/strings.go
@@ -52,6 +52,22 @@ func RemoveDoubledStrings(s string, target string) string {
 	)
 }
 
+// RemoveLeadingStrings removes all leading occurrences of target in s
+func RemoveLeadingStrings(s string, target string) string {
+	lenS := len(s)
+	lenTarget := len(target)
+
+	if lenS < lenTarget {
+		return s
+	}
+
+	if s[:lenTarget] != target {
+		return s
+	}
+
+	return RemoveLeadingStrings(s[lenTarget:], target)
+}
+
 // SanitizeStringWithWhitelist cleans s by all substrings which do not occur in whitelist
 func SanitizeStringWithWhitelist(s string, whitelist map[string]string) string {
 	sanitizedString := ""
diff --git a/strings_test.go b/strings_test.go
index 3a4f088..fef294f 100644
--- a/strings_test.go
+++ b/strings_test.go
@@ -1,6 +1,8 @@
 package utils
 
-import "testing"
+import (
+	"testing"
+)
 
 func TestFirstCharacterToUppercase(t *testing.T) {
 	data := map[string]string{
@@ -56,6 +58,36 @@ func TestRemoveDoubledStrings(t *testing.T) {
 	}
 }
 
+func TestRemoveLeadingStrings(t *testing.T) {
+	data := map[string]string{
+		"":  "",
+		".": "",
+		"...Jahr 2022... die überleben wollen...": "Jahr 2022... die überleben wollen...",
+	}
+
+	for d, expectedResult := range data {
+		result := RemoveLeadingStrings(d, ".")
+		if result != expectedResult {
+			t.Errorf("\ngot:    %q\nwanted: %q\nfor:    %q", result, expectedResult, d)
+		}
+	}
+
+	data = map[string]string{
+		"":     "",
+		".":    ".",
+		"..":   "..",
+		"...":  "",
+		"....": ".",
+	}
+
+	for d, expectedResult := range data {
+		result := RemoveLeadingStrings(d, "...")
+		if result != expectedResult {
+			t.Errorf("\ngot:    %q\nwanted: %q\nfor:    %q", result, expectedResult, d)
+		}
+	}
+}
+
 func TestSanitizeStringWithWhitelist(t *testing.T) {
 	whitelistedChars := []string{
 		".", "-",