Markdown file titles are all reduced by one level

Use one python Script can solve the problem ;

fileName = r'F:\md note \java\file.md'
with open(file=fileName, mode="r", encoding='utf-8') as f1:
    lines = f1.readlines()
    for i in range(0, len(lines)):
        if lines[i][0] == '#':
            lines[i] = '#' + lines[i]

# To be processed lines Write to a new file 
fileName2 = r'F:\md note \java\file- modify .md'
with open(file = fileName2,mode='w',encoding='utf-8') as f2:
    f2.writelines(lines)