diff --git a/cw-indexed-capitaliztion/README.md b/cw-indexed-capitaliztion/README.md
new file mode 100644
index 0000000..edc9234
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+++ b/cw-indexed-capitaliztion/README.md
@@ -0,0 +1,10 @@
+# Indexed capitalization
+
+Given a string and an array of integers representing indices, capitalize all letters at the given indices.
+
+For example:
+
+'capitalize("abcdef",[1,2,5]) = "aBCdeF"'
+'capitalize("abcdef",[1,2,5,100]) = "aBCdeF"'. There is no index 100.
+
+The input will be a lowercase string with no spaces and an array of digits.
diff --git a/cw-indexed-capitaliztion/go.mod b/cw-indexed-capitaliztion/go.mod
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index 0000000..4677132
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+++ b/cw-indexed-capitaliztion/go.mod
@@ -0,0 +1,3 @@
+module github.com/skosovsky/algo/cw-indexed-capitaliztion
+
+go 1.21.5
diff --git a/cw-indexed-capitaliztion/main.go b/cw-indexed-capitaliztion/main.go
new file mode 100644
index 0000000..6ddc8ee
--- /dev/null
+++ b/cw-indexed-capitaliztion/main.go
@@ -0,0 +1,34 @@
+package main
+
+import (
+	"fmt"
+	"unicode"
+)
+
+func main() {
+	fmt.Println(Capitalize("abcdef", []int{1, 2, 5})) //nolint:gomnd
+}
+
+func Capitalize(st string, arr []int) string {
+	var line = []rune(st)
+	var newline []rune
+	digits := map[int]bool{}
+
+	for _, v := range arr {
+		if v > len(line) {
+			continue
+		}
+		digits[v] = true
+	}
+
+	for i, _ := range line {
+		symbol := line[i]
+		if digits[i] {
+			newline = append(newline, unicode.ToUpper(symbol))
+		} else {
+			newline = append(newline, symbol)
+		}
+	}
+
+	return string(newline)
+}
diff --git a/cw-indexed-capitaliztion/main_test.go b/cw-indexed-capitaliztion/main_test.go
new file mode 100644
index 0000000..8899a1c
--- /dev/null
+++ b/cw-indexed-capitaliztion/main_test.go
@@ -0,0 +1,53 @@
+package main
+
+import "testing"
+
+func TestCapitalize(t *testing.T) {
+	type args struct {
+		st  string
+		arr []int
+	}
+	tests := []struct {
+		name string
+		args args
+		want string
+	}{
+		{
+			name: "Example 1",
+			args: args{"abcdef", []int{1, 2, 5}},
+			want: "aBCdeF",
+		},
+		{
+			name: "Example 2",
+			args: args{"abcdef", []int{1, 2, 5, 100}},
+			want: "aBCdeF",
+		},
+		{
+			name: "Example 3",
+			args: args{"codewars", []int{1, 3, 5, 50}},
+			want: "cOdEwArs",
+		},
+		{
+			name: "Example 4",
+			args: args{"abRacaDabRA", []int{2, 6, 9, 10}},
+			want: "abRacaDabRA",
+		},
+		{
+			name: "Example 5",
+			args: args{"codewarriors", []int{5}},
+			want: "codewArriors",
+		},
+		{
+			name: "Example 6",
+			args: args{"indexinglessons", []int{0}},
+			want: "Indexinglessons",
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := Capitalize(tt.args.st, tt.args.arr); got != tt.want {
+				t.Errorf("Capitalize() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}