Uncomment required inclusion for 2-3 and update progress to 3-4

CMakeLists.txt

@@ -3,9 +3,9 @@ cmake_minimum_required(VERSION 3.0)
 project(learningc LANGUAGES C)
 
 set(CHAPTER 2)
-set(EXERCISE 3)
+set(EXERCISE 4)
 
 add_executable(learningc chapters/${CHAPTER}/exercises/${EXERCISE}.c)
-target_link_libraries(learningc m) # Required for 2-3
+#target_link_libraries(learningc m) # Required for 2-3
 
 install(TARGETS learningc RUNTIME DESTINATION bin)

chapters/2/exercises/4.c

@@ -0,0 +1,25 @@
+#include <stdio.h>
+
+void squeeze(char s1[], char s2[]);
+int main() {
+	char sent[] = "I am a ssssnake!", banned[] = "as";
+	squeeze(sent,banned);
+	printf("Result: %s", sent);
+	return 0;
+}
+void squeeze(char s1[], char s2[]) {
+	int i,j,k,s; // i is writing position and k is reading position
+	for (i = 0, k = 0; s1[k] != '\0'; k++) {
+		for (s = 0, j = 0; s2[j] != '\0'; j++) {
+			// We check if we have a disallowed character and break if it is the case
+			if (s1[k] == s2[j]) {
+				s = 1;
+				break;
+			}
+		}
+		if (!s) {
+			s1[i++] = s1[k]; // As long as the character is not disallowed, write it and increase the write position
+		}
+	}
+	s1[i] = '\0';
+}