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#include <string.h>
#include <stdlib.h>
/* function: char *string_format(char* string)
* input: pointer to a null-terminated string (must not be NULL)
* return: pointer to a newly allocated string containing all space-separated words,
* joined by single spaces; leading/trailing/multiple spaces are ignored.
* on-error: returns NULL if memory allocation fails
* misc: the returned pointer must be freed by the caller using free()
* limits: processes at most 10 words, each up to 49 characters (last '\0')
*/
char *string_format(char* string) {
// Wörterbuch array [Wort][Zeichenkette]
char woerter[10][50] = { 0 };
int wort_index = 0;
int char_index = 0;
while (*string != '\0') {
// add '\0' stringterminator to end of word
if (*string == ' ' && char_index > 0) {
// safty check for array length
if (wort_index > 9 || char_index > 49) {
break;
}
// next slot is char
// add '\0' to end string
woerter[wort_index][char_index] = '\0';
wort_index++;
char_index = 0;
string++;
continue;
}
// skip extra spaces
else if (*string == ' ' && char_index == 0) {
string++;
continue;
}
// safty check for array length
if (char_index >= 49) {
break;
}
woerter[wort_index][char_index] = *string;
char_index++;
string++;
}
// terminate last word with '\0'
if (char_index > 0 && wort_index < 10 && char_index < 49) {
woerter[wort_index][char_index] = '\0';
wort_index++;
}
/*
* return
*/
char *ptr = NULL;
// get length of woerter array
if (wort_index == 0) {
ptr = NULL;
} else {
int sum = 0;
for (int i = 0; i < wort_index; i++) {
sum += strlen(woerter[i]);
}
sum += wort_index - 1; // for spaces
sum += 1; // for Nulltermination
ptr = (char *)malloc(sum);
// check for NULL pointer
if (ptr == NULL) {
return NULL;
}
//strcpy
char *ende = ptr;
for (int i = 0; i < wort_index; i++) {
ende = stpcpy(ende, woerter[i]);
if (i != wort_index - 1) {
*(ende++) = ' ';
}
}
}
return ptr;
}
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