编写一个程序，用以读入一个C语言程序，并按照字母表顺序分组打印变量名，

要求每一组内各变量名的前6个字符相同，其余字符不同。字符串和注释中的

单词不予考虑。请将6作为一个可在命令行中设定的参数。-Write a program to read into a C language program, and grouped alphabetically print the variable name,

Requires each within the same group of six characters before each variable name, different remaining characters. Strings and comments in

Words will not be considered. Please six as a parameter that can be set on the command line.