如何把代码写的清晰，易理解。求高手分享写代码经验。

程序代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define _STDC_WANT_LIB_EXT1_ 1
#define buffer_len 10
#define buffer_len_inc 5
#define string_cont 5
#define string_cont_inc 2

int main(void)
{

int test_int = 0;    
    int buf_len = buffer_len;
    char* p_start =NULL;
    char* p_buf_temp = NULL;
    int current_buf_len = 0;
    char* p_buffer = NULL;

char** str_dre_dre = NULL;
    char** str_dre_temp = NULL;
    char** str_start = NULL;
    int count = 0;
    int str_cont = string_cont;

printf("input something you want : \n");

//memory initialization

str_dre_dre = (char**)malloc(str_cont * sizeof(char*));
        if(str_dre_dre == NULL)
        {
             printf("malloc() function error!!!\n");
             exit(1);
        }
    str_start = str_dre_dre;

p_buffer = (char*)malloc(buf_len * sizeof(char));
       if(p_buffer == NULL)
       {
           printf("malloc() function error!!!\n");
           exit(1);
       }
    p_start = p_buffer;
    
    //memory initialization end

do
    {
        p_buffer = p_start;
        fflush(stdin);
        do
        {
            *p_buffer = getchar(); 
            p_buffer++;
               if((p_buffer - p_start) == buf_len)   
               {
                   buf_len += buffer_len_inc;
                   p_buf_temp = (char*)realloc(p_start, buf_len * sizeof(char));
                      if(p_buf_temp == NULL)
                      {
                          printf("realloc() function error!!!\n"); 
                          exit(1);
                      }
                   p_buffer = p_buf_temp + (p_buffer - p_start);
                   p_start = p_buf_temp;
                   p_buf_temp = NULL;
               }
        }
        while(*(p_buffer - 1) != ‘\n‘);

if(*(p_start) == ‘\n‘ )
        {// if don‘t input anything
            printf("you don‘t input anything!!!\n");
            break;
        }
        *(p_buffer - 1) = ‘\0‘;
   
        current_buf_len = strlen(p_start);
        
        *(str_dre_dre + count) = (char*)malloc(current_buf_len);
            if(*(str_dre_dre + count) == NULL)
            {
                printf("malloc() function error!!!\n");
                exit(1);
            }   
         test_int = strcpy_s(*(str_dre_dre + count), current_buf_len + 1, p_start);
            if(test_int != 0)
            {
                printf("strcpy_s() function error!!!\n");
                exit(1);
            }

if(count == str_cont - 1)
        {
            str_cont += string_cont_inc;
            str_dre_temp = (char**)realloc(str_start, str_cont * sizeof(char*));
                if(str_dre_temp == NULL)
                {
                     printf("realloc() function error!!!\n");
                     exit(1);
                 }
            str_dre_dre = str_dre_temp;
            str_start = str_dre_temp;
            str_dre_temp = NULL;
        }
        count++;
                
        printf("you are already input %d string%s.\n",count, (count == 1) ? "" : "s");
        printf("continue?(Y/N)");
        fflush(stdin);      
   }
    while(tolower((char)getchar()) == ‘y‘);
    printf("ouput strings: \n");
    for(int i = 0; i < count; ++i)
    {
        printf("%s\n", *(str_start + i));
        free(*(str_start + i));
        *(str_start + i) = NULL;
    }
    
    free(p_buffer);
    free(str_dre_dre);
    p_buffer = p_start = NULL;
    str_start = str_dre_dre = NULL;

return 0;
}

我写了一个可以输入任意个字符串，同时字符串长度不收限制的小程序。代码能工作，稳定。但是感觉看起来惨不忍睹，逻辑混乱，思路不清晰，感觉像一坨屎，怎么把代码写的优美一点。希望高手支招，或者介绍书籍也可以。

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