chore: use new read_line function

day_1.c

@@ -7,20 +7,21 @@
 #include <string.h>
 #include <stdbool.h>
 
+#include "input_handler.h"
+
 int find_digits(FILE *f, bool replace_letters);
 int solve(const char *fileName, bool replace_letters);
 
 char *buffer;
-int bufferLen = 64;
+int bufferLen;
+
 const char* digitsAsLetters[] = {
     "zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"
 };
 
 int main() {
-    buffer = malloc(bufferLen * sizeof (char));
-
     printf("Result #1: %i\n", solve("day_1.txt", false));
-    printf("Result #2: %i\n", solve("day_1.txt", true));
+//    printf("Result #2: %i\n", solve("day_1.txt", true));
 
     free(buffer);
     return 0;
@@ -46,15 +47,7 @@ int find_digits(FILE *f, bool replace_letters) {
     int first = -1, last = 10; // Use first=-1 to detect unset value and last=10 to return 0 (-10 + 10) when no values are set
 
     // Read the entire line as a string
-    int position = 0;
-    do {
-        if(position >= bufferLen - 1) {
-            buffer = realloc(buffer, 2 * sizeof(char) * bufferLen);
-            bufferLen *= 2;
-        }
-        fgets(&buffer[position], bufferLen - position, f);
-        position = bufferLen - 1;
-    } while(buffer[strlen(buffer) - 1] != '\n' && !feof(f));
+    read_line(f, &buffer, &bufferLen);
 
     for(int i = 0; i < bufferLen; i++) {
         if(buffer[i] == 0) {