不分大小字母排序

写了个任意长度的字符不分大小写排序,不过有点长.
#include"stdio.h"
#include"stdlib.h"
main()
{       int i,j;
        int n=0;
        char *s,*p;
        char temp;
        printf("input the string:");
        gets(s);
        p=s;

        while(*p!='\0')
        {       n++;
                p++;
                
        }
       p=s;
for(i=0;i<n-1;i++)
        {       for(j=i+1;j<n;j++)
                {       if(*(p+i)>'A'&&*(p+i)<'Z')
                        {       if(*(p+j)>'A'&&*(p+j)<'Z')
                                {if(*(p+i)>*(p+j))
                                { temp=*(p+i);
                                  *(p+i)=*(p+j);
                                  *(p+j)=temp;
                                }
                                }
                                else
                                {       if((*(p+i)+32)>*(p+j))
                                        {       temp=*(p+i);
                                                *(p+i)=*(p+j);
                                                *(p+j)=temp;
                                        }
                                }
                        }

                        else
                        {
                                    if(*(p+j)>'a'&&*(p+j)<'z')
                                    {if(*(p+i)>*(p+j))
                                    {       temp=*(p+i);
                                            *(p+i)=*(p+j);
                                            *(p+j)=temp;
                                    }
                                    }
                                   else
                                   {       if(*(p+i)>(*(p+j)+32))
                                            {        temp=*(p+i);
                                                     *(p+i)=*(p+j);
                                                     *(p+j)=temp;
                                            }
                                   }
                        }


                }
        }
        puts(s);
        getch();
}