basics.h

   1
   2 #ifndef BASICS_H
   3 #define BASICS_H
   4
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <string.h>
   8 #include <ctype.h>
   9
  10 char* absorb_words (int count, char** string_list, int start_index)
  11 {
  12   char* result = calloc(sizeof(char), (count * 20));
  13   for (int i = start_index; i < count; i++)
  14     strcat(result, string_list[i]);
  15
  16   return result;
  17 }
  18
  19 char* __upcase (char* original)
  20 {
  21   char* result = calloc(sizeof(char), strlen(original));
  22   int index = 0;
  23   while (original[index])
  24     {
  25       result[index] = toupper(original[index]);
  26       index++;
  27     }
  28
  29   return result;
  30 }
  31
  32 char* strip_nonalpha (char* original)
  33 {
  34   int length = strlen(original);
  35   char* result = calloc(sizeof(char), length);
  36
  37   int count = 0;
  38   for (int i = 0; i < length; i++)
  39     {
  40       if (isalpha(original[i]))
  41         {
  42           result[count] = original[i];
  43           count++;
  44         }
  45     }
  46
  47   return result;
  48 }
  49
  50 char* strip_dupes (char* original)
  51 {
  52   int length = strlen(original);
  53   char* upcased = __upcase(original);
  54   char* result = calloc(sizeof(char), 26); // 26 unique characters in
  55                                            // the english alphabet
  56   int count = 0;
  57   for (int i = 0; i < length; i++)
  58     {
  59       if (!strchr(result, (int) upcased[i]))
  60         {
  61           result[count] = upcased[i];
  62           count++;
  63         }
  64     }
  65
  66   free(upcased);
  67   return result;
  68 }
  69
  70 char* string_process (char* string)
  71 {
  72   char* filtered = strip_nonalpha(string);
  73   char* result = strip_dupes(filtered);
  74
  75   free(filtered);
  76   return result;
  77 }
  78
  79 #endif