feat: linked list

Linked List in C/main.c

@@ -0,0 +1,115 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+typedef struct Node Node;
+
+struct Node {
+    int value;
+    Node* next;
+};
+
+Node* create_node(Node* previous_node) {
+    Node* new_node = (Node*)malloc(sizeof(Node));
+    new_node->next = NULL;
+    if (previous_node != NULL) {
+        previous_node -> next = new_node;
+    }
+    return new_node;
+}
+
+void delete_node(Node* previous_node) {
+    Node* exact_node = previous_node->next;
+    previous_node->next = exact_node->next;
+    free(exact_node);
+}
+
+Node* search_node(Node* head_node, int index) {
+    int i = 0;
+    Node* node = head_node;
+    while (node != NULL) {
+        if (i == index) {
+            return node;
+        }
+        node = node->next;
+        i++;
+    }
+    return NULL;
+}
+
+void change_node_value(Node* head_node, int index, int value) {
+    Node* searched_void = search_node(head_node, index);
+    if (searched_void == NULL) {
+            printf("Out of range\n");
+    } else {
+            Node* searched = searched_void;
+            searched->value = value;
+    }
+}
+
+void travel_all_nodes(Node* head_node) {
+    Node* node = head_node;
+    int i = 0;
+    while (node != NULL) {
+        printf("%d. Node & Value is = %d\n", i, node->value);
+        node = node->next;
+        i++;
+    }
+}
+
+int main(void) {
+    printf("Hello World\n");
+
+    Node* head_node= create_node(NULL);
+    head_node->value = 0;
+
+    printf("How many node do you want ?\n");
+    int node_count = 0;
+    scanf("%d", &node_count);
+
+
+    Node* previous_node = head_node;
+    for (int i = 0; i<node_count-1;i++) {
+        create_node(previous_node);
+        previous_node = previous_node->next;
+        previous_node->value = i+1;
+    }
+
+    travel_all_nodes(head_node);
+
+    printf("Which node do you want to be deleted ?\n");
+    int delete_index = 0;
+    scanf("%d", &delete_index);
+    if (delete_index == 0) {
+        Node* head_node_will_be_deleted = head_node;
+        head_node = head_node->next;
+        free(head_node_will_be_deleted);
+    } else {
+        void* searched_previous_void = search_node(head_node, delete_index-1);
+        if (searched_previous_void == NULL) {
+            printf("Out of range\n");
+            return -1;
+        } else {
+            Node* searched_previous = searched_previous_void;
+            if (searched_previous->next != NULL) {
+                delete_node(searched_previous);
+                printf("Deleted\n");
+            } else {
+                printf("Out of range\n");
+                return -1;
+            }
+        }
+    }
+
+    travel_all_nodes(head_node);
+
+    printf("Which node do you want to change it's value ?\n");
+    int change_node_value_index = 0;
+    scanf("%d", &change_node_value_index);
+
+    printf("What value do you want to assign ?\n");
+    int new_node_value = 0;
+    scanf("%d", &new_node_value);
+    change_node_value(head_node, change_node_value_index, new_node_value);
+
+    travel_all_nodes(head_node);
+}