From e5f2e2aeb9fcd6af863e8dec62ad67f68549a59b Mon Sep 17 00:00:00 2001
From: duphyf <ytgjnhs@proton.me>
Date: Sun, 30 Nov 2025 13:59:36 +0200
Subject: [PATCH 1/2] Refactor remove_trailing_blanks: fix logic and return
 updated length

---
 chapter_1/exercise_1_18/trailing_blanks.c | 119 ++++++++++++----------
 1 file changed, 68 insertions(+), 51 deletions(-)

diff --git a/chapter_1/exercise_1_18/trailing_blanks.c b/chapter_1/exercise_1_18/trailing_blanks.c
index 6203d76..726160a 100644
--- a/chapter_1/exercise_1_18/trailing_blanks.c
+++ b/chapter_1/exercise_1_18/trailing_blanks.c
@@ -1,51 +1,68 @@
-#include <stdio.h>
-
-#define MAXLINE 1000
-
-int get_line(char line[], int max_line_len);
-void remove_trailing_blanks(char line[], int length);
-
-int main(void)
-{
-  int len;
-  char line[MAXLINE];
-
-  while ((len = get_line(line, MAXLINE)) > 0)
-  {
-    remove_trailing_blanks(line, len);
-    printf("%s", line);
-  }
-
-  return 0;
-}
-
-int get_line(char line[], int max_line_len)
-{
-  int c, i;
-
-  for (i = 0; i < max_line_len - 1 && (c = getchar()) != EOF && c != '\n'; ++i)
-  {
-    line[i] = c;
-  }
-
-  if (c == '\n')
-  {
-    line[i] = c;
-    ++i;
-  }
-
-  line[i] = '\0';
-
-  return i;
-}
-
-void remove_trailing_blanks(char line[], int length)
-{
-  int i;
-
-  for (i = length - 2; line[i] == ' ' || line[i] == '\t'; --i)
-    ;
-
-  line[i + 1] = '\n';
-  line[i + 2] = '\0';
-}
+#include <stdio.h>
+
+#define MAXLINE 1000
+
+int get_line(char line[], int max_line_len);
+int remove_trailing_blanks(char line[], int length);
+
+int main(void)
+{
+  int len;
+  char line[MAXLINE];
+
+  while ((len = get_line(line, MAXLINE)) > 0)
+  {
+    remove_trailing_blanks(line, len);
+    printf("%s", line);
+  }
+
+  return 0;
+}
+
+int get_line(char line[], int max_line_len)
+{
+  int c, i;
+
+  for (i = 0; i < max_line_len - 1 && (c = getchar()) != EOF && c != '\n'; ++i)
+  {
+    line[i] = c;
+  }
+
+  if (c == '\n')
+  {
+    line[i] = c;
+    ++i;
+  }
+
+  line[i] = '\0';
+
+  return i;
+}
+
+#define HAS_NEWLINE 1
+#define NO_NEWLINE 0
+
+int remove_trailing_blanks(char line[], int length)
+{
+  int i, has_newline;
+
+  has_newline = NO_NEWLINE;
+
+  for (i = length - 1; i >= 0 && (line[i] == '\n' || line[i] == ' ' || line[i] == '\t'); --i)
+  {
+    if (line[i] == '\n')
+    {
+      has_newline = HAS_NEWLINE;
+    }
+  }
+
+  if (has_newline == HAS_NEWLINE)
+  {
+    line[i + 1] = '\n';
+    line[i + 2] = '\0';
+    return i + 2;
+  }
+
+  line[i + 1] = '\0';
+  return i + 1;
+}

From ff98d264f3610f0f71b29db0ba71fb0cef5dafdb Mon Sep 17 00:00:00 2001
From: duphyf <ytgjnhs@proton.me>
Date: Sun, 30 Nov 2025 14:00:08 +0200
Subject: [PATCH 2/2] Add logic to delete entirely blank lines

---
 chapter_1/exercise_1_18/trailing_blanks.c | 140 +++++++++++-----------
 1 file changed, 72 insertions(+), 68 deletions(-)

diff --git a/chapter_1/exercise_1_18/trailing_blanks.c b/chapter_1/exercise_1_18/trailing_blanks.c
index 726160a..ddace15 100644
--- a/chapter_1/exercise_1_18/trailing_blanks.c
+++ b/chapter_1/exercise_1_18/trailing_blanks.c
@@ -1,68 +1,72 @@
-#include <stdio.h>
-
-#define MAXLINE 1000
-
-int get_line(char line[], int max_line_len);
-int remove_trailing_blanks(char line[], int length);
-
-int main(void)
-{
-  int len;
-  char line[MAXLINE];
-
-  while ((len = get_line(line, MAXLINE)) > 0)
-  {
-    remove_trailing_blanks(line, len);
-    printf("%s", line);
-  }
-
-  return 0;
-}
-
-int get_line(char line[], int max_line_len)
-{
-  int c, i;
-
-  for (i = 0; i < max_line_len - 1 && (c = getchar()) != EOF && c != '\n'; ++i)
-  {
-    line[i] = c;
-  }
-
-  if (c == '\n')
-  {
-    line[i] = c;
-    ++i;
-  }
-
-  line[i] = '\0';
-
-  return i;
-}
-
-#define HAS_NEWLINE 1
-#define NO_NEWLINE 0
-
-int remove_trailing_blanks(char line[], int length)
-{
-  int i, has_newline;
-
-  has_newline = NO_NEWLINE;
-
-  for (i = length - 1; i >= 0 && (line[i] == '\n' || line[i] == ' ' || line[i] == '\t'); --i)
-  {
-    if (line[i] == '\n')
-    {
-      has_newline = HAS_NEWLINE;
-    }
-  }
-
-  if (has_newline == HAS_NEWLINE)
-  {
-    line[i + 1] = '\n';
-    line[i + 2] = '\0';
-    return i + 2;
-  }
-
-  line[i + 1] = '\0';
-  return i + 1;
-}
+#include <stdio.h>
+
+#define MAXLINE 1000
+
+int get_line(char line[], int max_line_len);
+int remove_trailing_blanks(char line[], int length);
+
+int main(void)
+{
+  int len;
+  char line[MAXLINE];
+
+  while ((len = get_line(line, MAXLINE)) > 0)
+  {
+    len = remove_trailing_blanks(line, len);
+
+    if (len > 1 || line[0] != '\n')
+    {
+      printf("%s", line);
+    }
+  }
+
+  return 0;
+}
+
+int get_line(char line[], int max_line_len)
+{
+  int c, i;
+
+  for (i = 0; i < max_line_len - 1 && (c = getchar()) != EOF && c != '\n'; ++i)
+  {
+    line[i] = c;
+  }
+
+  if (c == '\n')
+  {
+    line[i] = c;
+    ++i;
+  }
+
+  line[i] = '\0';
+
+  return i;
+}
+
+#define HAS_NEWLINE 1
+#define NO_NEWLINE 0
+
+int remove_trailing_blanks(char line[], int length)
+{
+  int i, has_newline;
+
+  has_newline = NO_NEWLINE;
+
+  for (i = length - 1; i >= 0 && (line[i] == '\n' || line[i] == ' ' || line[i] == '\t'); --i)
+  {
+    if (line[i] == '\n')
+    {
+      has_newline = HAS_NEWLINE;
+    }
+  }
+
+  if (has_newline == HAS_NEWLINE)
+  {
+    line[i + 1] = '\n';
+    line[i + 2] = '\0';
+    return i + 2;
+  }
+
+  line[i + 1] = '\0';
+  return i + 1;
+}