need help biggest_seq + charfreq

Author: mantertius

charFreq.c

@@ -0,0 +1,77 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#define debug if(0)
+
+typedef struct node{
+    char a;
+    int freq;
+    struct node* next;
+}node;
+
+node* init()
+{
+    return NULL;
+}
+
+node* add(node* head, char item, int freq)
+{
+    node* new_node = (node*) malloc(sizeof(node*));
+
+    new_node->a = item;
+    new_node->freq = freq;
+    new_node->next = head;
+
+    return new_node;
+}
+
+void printer(node*head)
+{
+    while (head != NULL)
+    {
+        printf("%c %d\n", head->a, head->freq);
+        head = head->next;
+    }
+}
+node* search(node* head, char data)
+{
+    while (head != NULL)
+    {
+        if (head->a == data)
+        {
+            return head;
+        }
+        head = head->next;
+    }
+    return NULL;
+}
+int main()
+{
+    char str[1000];
+    int i = 0;
+    fgets(str,1000,stdin);
+    int max = strlen(str);
+    char* pch;
+    int freq;
+    node* lista = init();
+    for (int i = 0; i < max  ; i++)
+    {   
+        freq = 0;
+        char tmp = str[i];
+        for (int j = 0; j < max; j++)
+        {
+            if (tmp == str[j])
+            {
+                freq++;
+            }
+        }
+        debug printf("[%c] [%d]\n",str[i],freq);
+        if (search(lista,tmp) == NULL)
+        {
+            lista = add(lista,tmp,freq);
+        }        
+    }
+    printer(lista);
+    return 0;
+}
+//TODO #2 criar uma maneira de ordenar a saida na ordem anti-alfabética