Add project files

.gitignore

+### C++ template
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
+
+### JetBrains template
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff:
+.idea/workspace.xml
+.idea/tasks.xml
+.idea/dictionaries
+.idea/vcs.xml
+.idea/jsLibraryMappings.xml
+
+# Sensitive or high-churn files:
+.idea/dataSources.ids
+.idea/dataSources.xml
+.idea/dataSources.local.xml
+.idea/sqlDataSources.xml
+.idea/dynamic.xml
+.idea/uiDesigner.xml
+
+# Gradle:
+.idea/gradle.xml
+.idea/libraries
+
+# Mongo Explorer plugin:
+.idea/mongoSettings.xml
+
+## File-based project format:
+*.iws
+
+## Plugin-specific files:
+
+# IntelliJ
+/out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+.idea
+cmake-build-debug
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CMakeLists.txt

+cmake_minimum_required(VERSION 3.20)
+project(homework1 C)
+
+set(CMAKE_C_STANDARD 11)
+
+add_executable(homework1
+        main.c)

main.c

+#include <stdio.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <string.h>
+#include <malloc.h>
+
+int count_files_in_dir(char* path) {
+    int file_count = 0;
+    DIR * dir;
+    struct dirent * entry;
+
+    dir = opendir(path);
+    while ((entry = readdir(dir)) != NULL) {
+        if (strcmp(entry->d_name,".") == 0 || strcmp(entry->d_name,"..") == 0) {
+            continue;
+        }
+        file_count++;
+    }
+    closedir(dir);
+    return file_count;
+}
+
+int main(int argc, char *argv[]) {
+    if(argc == 1) {
+        printf("Not enough parameters provided!");
+        return 1;
+    } else {
+        DIR * dir;
+        struct dirent * entry;
+
+        dir = opendir(argv[1]);
+        if (!dir) {
+            return 0;
+        }
+        while ((entry = readdir(dir)) != NULL) {
+            if (strcmp(entry->d_name,".") == 0 || strcmp(entry->d_name,"..") == 0) {
+                continue;
+            }
+            char * entry_path; // string concatenation
+            if((entry_path = malloc(strlen(argv[1]) + strlen(entry->d_name) + 2)) != NULL){
+                entry_path[0] = '\0';
+                strcat(entry_path, argv[1]);
+                strcat(entry_path, "/");
+                strcat(entry_path, entry->d_name);
+            } else {
+                return 1;
+            }
+
+            if (entry->d_type == DT_REG) {
+                unlink(entry_path);
+            } else if (entry->d_type == DT_DIR && count_files_in_dir(entry_path) == 0) {
+                rmdir(entry_path);
+            }
+            free(entry_path);
+        }
+        closedir(dir);
+        if(count_files_in_dir(argv[1]) == 0) {
+            rmdir(argv[1]);
+        } else {
+            printf("Couldn't delete all files, because there was a non empty folder!\n");
+            return 1;
+        }
+        return 0;
+    }
+}
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