我有几个zip文件内提交文件夹每个包含多个文件夹和文件在他们。我需要从zip文件的名称中提取学生ID，并根据其扩展名创建一个目标文件夹，该文件夹将包含提取的zip文件中的C，Python和Java文件。我写了一个递归算法visit（），它获取源目录，并在解压缩后识别文件扩展名，将它们重命名为main.c/main.py/Main.java，并将它们分别移动到target/C，target/Python和target/Java，但我的代码只将内容解压缩到submissions文件夹中，其他什么也不做。我不知道如何解决这个问题。

#!/bin/bash
# Create target directory
mkdir targets
# Create subdirectories for C, Python, and Java
mkdir targets/C
mkdir targets/Python
mkdir targets/Java
# Loop through all files in submissions directory
for file in submissions/*.zip
do
  # Extract the contents of the zip file
  unzip "$file" -d /home/goat/Desktop/Jaid/'CSE 314'/'Offline 1'/Workspace/submissions
  # Get the student ID from the file name
  student_id=${file: -11:7}
  #echo $student_id
  visit()
  {
    if [ -d $1 ]
    then
      for i in $1/*
      do
        visit "$i"
      done
    elif [ -f $1 ]
    then
      #echo $1
      # Get the file extension
      file_extension=${1: -1}
      # Check if the file extension is C, Python, or Java
      # for c
      if [ "$file_extension" == "c" ]
      then
        # Copy the C file to the targets/C directory
        cp "$1" targets/C/"$student_id"/main.c
      #for py
      elif [ "$file_extension" == "y" ]
      then
        # Copy the Python file to the targets/Python directory
        cp "$1" targets/Python/"$student_id"/main.py
      #for java
      elif [ "$file_extension" == "a" ]
      then
        # Copy the Java file to the targets/Java directory
        cp "$1" targets/Java/"$student_id"/Main.java
      fi
        fi
  }
  
  visit submissions

  # Remove the extracted files
  #rm -rf "$file"
done