diff --git a/dev/Dockerfile b/dev/Dockerfile
index b774af7..e9e0a9a 100644
--- a/dev/Dockerfile
+++ b/dev/Dockerfile
@@ -1,19 +1,19 @@
 FROM ubuntu:22.04
 
-RUN sed -i 's/archive.ubuntu.com/mirrors.ustc.edu.cn/g' /etc/apt/sources.list             ; \
-    sed -i 's/security.ubuntu.com/mirrors.ustc.edu.cn/g' /etc/apt/sources.list            ; \
-    apt-get update                                                                        ; \
-    apt-get install -y --no-install-recommends build-essential zlib1g-dev libncurses5-dev   \
-                   libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev gcc g++    \
+RUN sed -i 's/archive.ubuntu.com/mirrors.ustc.edu.cn/g' /etc/apt/sources.list; \
+    sed -i 's/security.ubuntu.com/mirrors.ustc.edu.cn/g' /etc/apt/sources.list; \
+    apt-get update; \
+    apt-get install -y --no-install-recommends build-essential zlib1g-dev libncurses5-dev \
+                   libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev gcc g++ \
                    libsqlite3-dev wget libbz2-dev coreutils util-linux ca-certificates wget \
-                   patch dstat vim curl git sudo glibc-source python3 python3-pip python2 ; \
-    apt-get clean                                                                         ; \ 
-    rm -rf /var/lib/apt/lists/*                                                           ; \ 
-    ln -s /usr/bin/python3 /usr/bin/python           
+                   patch dstat vim curl git sudo glibc-source python3 python3-pip python2; \
+    apt-get clean; \ 
+    rm -rf /var/lib/apt/lists/*; \ 
+    ln -s /usr/bin/python3 /usr/bin/python
 
 ADD nvm.tar.gz /home/nvm/.nvm
 
-RUN useradd -d /home/nvm -s /bin/bash nvm              ; \
+RUN useradd -d /home/nvm -s /bin/bash nvm; \
     echo 'nvm ALL=(ALL) NOPASSWD: ALL' >> /etc/sudoers; \
     chown nvm:nvm -R "home/nvm/"
 
@@ -21,12 +21,11 @@ USER nvm
 
 WORKDIR /home/nvm
 
-RUN echo 'export NVM_DIR="$HOME/.nvm"' >> "$HOME/.bashrc"                                                                        ; \
-    echo '[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"  # This loads nvm' >> "$HOME/.bashrc"                                  ; \
-    echo '[ -s "$NVM_DIR/bash_completion" ] && . "$NVM_DIR/bash_completion" # This loads nvm bash_completion' >> "$HOME/.bashrc" ; \
-    bash -c 'source $HOME/.nvm/nvm.sh                                                                                            ; \
-    nvm install 16                                                                                                               ; \ 
-    nvm install 14                                                                                                               ; \
+RUN echo 'export NVM_DIR="$HOME/.nvm"' >> "$HOME/.bashrc"; \
+    echo '[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"  # This loads nvm' >> "$HOME/.bashrc"; \
+    echo '[ -s "$NVM_DIR/bash_completion" ] && . "$NVM_DIR/bash_completion" # This loads nvm bash_completion' >> "$HOME/.bashrc"; \
+    bash -c 'source $HOME/.nvm/nvm.sh; \
+    nvm install 16; \ 
+    nvm install 14; \
     nvm install 12'
-    
-
+    
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