From 0704d3064a943255e3025670c92a43c1894ebc4c Mon Sep 17 00:00:00 2001
From: Matt <carmodym2@gmail.com>
Date: Sat, 6 Nov 2021 00:51:35 -0400
Subject: [PATCH 1/3] convert LcFirst tests to table driven format

---
 stringy_test.go | 31 +++++++++++++++++++++----------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/stringy_test.go b/stringy_test.go
index 800aff3..70646ae 100644
--- a/stringy_test.go
+++ b/stringy_test.go
@@ -123,18 +123,29 @@ func TestInput_KebabCase(t *testing.T) {
 }
 
 func TestInput_LcFirst(t *testing.T) {
-	str := New("This is an all lower")
-	against := "this is an all lower"
-	if val := str.LcFirst(); val != against {
-		t.Errorf("Expected: to be %s but got: %s", against, val)
+	tests := []struct {
+		name string
+		arg  string
+		want string
+	}{
+		{
+			name: "leading uppercase",
+			arg:  "This is an all lower",
+			want: "this is an all lower",
+		},
+		{
+			name: "empty string",
+			arg:  "",
+			want: "",
+		},
 	}
-}
 
-func TestInput_LcFirstEmpty(t *testing.T) {
-	str := New("")
-	against := ""
-	if val := str.LcFirst(); val != against {
-		t.Errorf("Expected: to be %s but got: %s", against, val)
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := New(tt.arg).LcFirst(); got != tt.want {
+				t.Errorf("LcFirst(%v) = %v, want %v", tt.arg, got, tt.want)
+			}
+		})
 	}
 }
 

From 2e5ad8d58b0d5088361298895fe8894665779570 Mon Sep 17 00:00:00 2001
From: Matt <carmodym2@gmail.com>
Date: Sat, 6 Nov 2021 00:54:21 -0400
Subject: [PATCH 2/3] add test for leading multi-byte character to demo bug

---
 stringy_test.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/stringy_test.go b/stringy_test.go
index 70646ae..715a2fd 100644
--- a/stringy_test.go
+++ b/stringy_test.go
@@ -138,6 +138,11 @@ func TestInput_LcFirst(t *testing.T) {
 			arg:  "",
 			want: "",
 		},
+		{
+			name: "multi-byte leading character",
+			arg:  "ΔΔΔ",
+			want: "δΔΔ",
+		},
 	}
 
 	for _, tt := range tests {

From 571d4cc48e59e4c758c402877ab89b3eb7b48f9f Mon Sep 17 00:00:00 2001
From: Matt <carmodym2@gmail.com>
Date: Sat, 6 Nov 2021 00:59:33 -0400
Subject: [PATCH 3/3] fix lcFirst leading multi-byte character bug

---
 stringy.go | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/stringy.go b/stringy.go
index cfcac33..046edbe 100644
--- a/stringy.go
+++ b/stringy.go
@@ -180,10 +180,10 @@ func (i *input) Last(length int) string {
 // function which return StringManipulation interface
 func (i *input) LcFirst() string {
 	input := getInput(*i)
-	for i, v := range input {
-		return string(unicode.ToLower(v)) + input[i+1:]
+	for _, v := range input {
+		return string(unicode.ToLower(v)) + input[len(string(v)):]
 	}
-	return input
+	return ""
 }
 
 // Lines returns slice of strings by removing white space characters