I want to add the word "Chapter" before the chapter number in the TOC (keeping the code) as follows

`Table of contents`

`Chapter 1: Chapter name`

and no as

`Table of contents`

`1 Chapter name`

How do it please?

[![enter image description here](https://i.stack.imgur.com/XPWhK.png)](https://i.stack.imgur.com/XPWhK.png)

This is my code

```
\documentclass[a4paper,11pt,x11names]{book}
\usepackage[french]{babel}
\usepackage{titlesec}
\usepackage{titletoc}

\usepackage{xcolor} 
\definecolor{ocre}{RGB}{243,102,25}

\contentsmargin{0cm}

\titlecontents{chapter}
[1.25cm] 
{\addvspace{12pt}\large\sffamily\bfseries} 
{\color{ocre!60}\contentslabel[\Large\thecontentslabel]{1.25cm}\color{ocre}}
{\color{ocre}}
{\ \color{ocre!60}\normalsize\titlerule*[.5pc]{.}\;\thecontentspage}

\titlecontents{section}
[2.5cm] 
{\addvspace{5pt}\sffamily\bfseries} 
{\contentslabel[\thecontentslabel]{1.25cm}}
{}
{\ \normalsize\titlerule*[.5pc]{.}\;\thecontentspage}

\titlecontents{subsection}
[3.75cm] 
{\addvspace{1pt}\sffamily\small}
{\contentslabel[\thecontentslabel]{1.25cm}}
{} 
{\ \titlerule*[.5pc]{.}\;\thecontentspage}

\begin{document}

\tableofcontents

\chapter{Chapter 1}

\section{Section 1}

\subsection{Subsection 1}

 \subsubsection{Subsubsection}

\end{document}

```