Not getting the wanted output in project with structs

Question

Given Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct charact
{
    char ch;
    int occurs;
    struct charact *next;
};
typedef struct charact Char;
typedef Char * ListofChar;
typedef Char * CharNode_ptr;
void letters(char name[50], ListofChar * chars_ptr);
void report(ListofChar chars);
Char * createnode(char ch);
int main(void)
{
    char name[50];
    ListofChar chars = NULL;
    scanf("%49s", name);
    letters(name, &chars);
    report(chars);
    return 0;
}
Char * createnode(char ch)
{
    CharNode_ptr newnode_ptr ;
    newnode_ptr = malloc(sizeof (Char));
    newnode_ptr -> ch = ch;
    newnode_ptr -> occurs = 0;
    newnode_ptr -> next = NULL;
    return newnode_ptr;
}
void letters(char name[50], ListofChar * lst_ptr)
{
    /* add your code */
    return;
}
void report(ListofChar chars)
{
    /* add your code */
    return;
}

My code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct charact
{
    char ch;
    int occurs;
    struct charact *next;
};

typedef struct charact Char;
typedef Char * ListofChar;
typedef Char * CharNode_ptr;
void letters(char name[50], ListofChar * chars_ptr);
void report(ListofChar chars,int length);
void distance(char name[50],size_t size,Char *chars);
Char * createnode(char ch);

int main(void)
{
    char name[50];
    ListofChar chars = NULL;
    scanf("%49s", name);
    letters(name, &chars);
    report(chars,strlen(name));
    return 0;
}

Char * createnode(char ch)
{
    CharNode_ptr newnode_ptr ;
    newnode_ptr = malloc(sizeof (Char));
    newnode_ptr -> ch = ch;
    newnode_ptr -> occurs = 0;
    newnode_ptr -> next = NULL;
    return newnode_ptr;
}

void letters(char name[50], ListofChar * lst_ptr)
{
    /* add your code */
    size_t i, j;
    j = strlen(name);
    memset(lst_ptr, 0, 50*sizeof (Char));


    for(i = 0; i < j; i++){
        distance(name, i, *lst_ptr);
    }
    return;
    }


void report(ListofChar chars,int length)
{
    int i;

    for(i = 0; i < length; i++){
        printf("\n%c: %d", chars[i].ch, chars[i].occurs);
    }
    /* add your code */
    return;
}

void distance(char name[50],size_t size,Char *chars)
{
    int i,length;
    length = strlen(name);
    chars -> ch = name[size];

    for (i=size+1; i<length; i++)
    {
        if(name[i] == chars -> ch)
        {
            chars-> occurs = i - size;
            return;
        }
    }

    chars ->occurs=0;
    return;
}

I want this program to print the distance from the next repeated letter. For example: testing t:3 e:0 s:0 t:0 i:0 n:0 g:0

Instead i get no output.Im new to C programming and im pretty average,this is a Uni project.I believe that the createnode function will be used in later versions of the project but im not sure.Thanks in advance.