Argthtjtr

I want to obtain in the header like the following

And in the footer

        documentclass[12pt,a4paper]{report}



usepackage{fancyhdr}

pagestyle{fancy}



  renewcommand{headrulewidth}{1.pt}% filet en haut de page

  renewcommand{footrulewidth}{0.pt}% filet en bas de page



   newcommand{clearemptydoublepage}{%

   newpage{pagestyle{plain}cleardoublepage}}



   setlength{headheight}{14.5pt}



   fancyhead[L,R]{bfseriesthepage}% Left Even, Right Odd

  fancyhead[L]{bfseriesrightmark} % Left Odd

   fancyhead[R]{bfseriesleftmark} % Right Even

   rhead{textbf{thepage}} %{textsl{rightmark}}

   lhead{textsl{nouppercase{leftmark}}}%{textbf{thepage}}







begin{document}

 chapter{Semigroup theory and sesquilinear forms}

 newpage

 cc



begin{thebibliography}{999}

newpage

bibitem{ax}{O. Rhandi,} {...,} ....

end{thebibliography}



end{document} 

I don't understand how to add footer. Also after compilation I get in the header

With fancyhdr:

documentclass[12pt,a4paper]{report}



usepackage{mwe}% Just for the example

usepackage{fancyhdr}

pagestyle{fancy}



renewcommand{headrulewidth}{1.pt}% filet en haut de page

renewcommand{footrulewidth}{0.pt}% filet en bas de page% A line of zero width in invisible



%newcommand{clearemptydoublepage}{%

%newpage{pagestyle{plain}cleardoublepage}}%That doesn't make any sense at all in a oneside document



setlength{headheight}{14.5pt}



renewcommand{chaptermark}[1]{markboth{#1}{}}

rhead{thepage}

lhead{leftmark}

lfoot{The title of the work}

rfoot{Carl Capybara}

cfoot{}







begin{document}

chapter{Manta Ray}

blindtext

section{Taxonomy}

blindtext[10]

chapter{Mobula}

blindtext

section{Life style}

blindtext[10]



end{document} 

With scrlayer-scrpage as shown in the Wikibook.

documentclass[headsepline,footsepline]{report}

usepackage{mwe}% just for the example



usepackage[markcase=noupper,% remove the uppercasing

automark

]{scrlayer-scrpage}



addtokomafont{pagehead}{sffamily}

addtokomafont{pagefoot}{sffamily}



ifoot*{Is life on Mars possible?}

ofoot*{Walter Wombat}

cfoot*{}

ohead*{pagemark}

ihead{leftmark}



renewcommand{chaptermarkformat}{}

setlength{footheight}{24.0pt}



begin{document}

chapter{Manta Ray}

blindtext

section{Taxonomy}

blindtext[10]

chapter{Mobula}

blindtext

section{Life style}

blindtext[10]

end{document}