How to create header of chapter name instead of section name about phd-thesis-template HOT 4 CLOSED

% Style 3: Sets Page Number at the Top with Chapter Name and an empty footer
\fancypagestyle{PageStyleIII}{
  \renewcommand{\chaptermark}[1]{\markboth{##1}{}}
  % Clear the headers
  \fancyhf{}
  \fancyhead[RE]{\leftmark}
  \fancyhead[LO]{\leftmark}
  \fancyhead[LE,RO]{\thepage}
}

% Set Fancy Header Command is defined to Load FancyHdr after Geometry is defined
\newcommand{\setFancyHdr}{

\pagestyle{fancy}

\ifPHD@pageStyleI
  % Style 1: Sets Page Number at the Top and Chapter/Section Name on LE/RO
  \pagestyle{PageStyleI}
\else
  \ifPHD@pageStyleII
    % Style 2: Sets Page Number at the Bottom with Chapter/Section Name on LO/RE
    \pagestyle{PageStyleII}
  \else
    \ifPHD@pageStyleIII
      % Style 3: Sets Chapter Name on LO/RE
      \pagestyle{PageStyleIII}
    \else
      % Default Style: Sets Page Number at the Top (LE/RO) with Chapter/Section Name
      % on LO/RE and an empty footer
      \renewcommand{\chaptermark}[1]{\markboth {##1}{}}
      \renewcommand{\sectionmark}[1]{\markright{\thesection\ ##1}}
      \fancyhf{}
      \fancyhead[LO]{\nouppercase \rightmark}
      \fancyhead[LE,RO]{\bfseries\thepage}
      \fancyhead[RE]{\nouppercase \leftmark}
    \fi  
  \fi
\fi
}

\newif\ifPHD@pageStyleIII\PHD@pageStyleIIIfalse % Set Page StyleIII
\DeclareOption{PageStyleIII}{\PHD@pageStyleIIItrue}

% Style 3: Sets Page Number at the Top with Chapter Name and an empty footer
\fancypagestyle{PageStyleIII}{
  \renewcommand{\chaptermark}[1]{\markboth{##1}{}}
  % Clear the headers
  \fancyhf{}
  \if@oneside
    \fancyhead[L]{\nouppercase \leftmark}
    \fancyhead[R]{\nouppercase \thepage}  
  \else
    \fancyhead[RE]{\nouppercase \leftmark}
    \fancyhead[LO]{\nouppercase \leftmark}
    \fancyhead[LE,RO]{\thepage}
  \fi
}