printf statement error - c

Question

my last printf statement is not printing I'm not sure what's wrong since I'm using getchar to read the standard input, I must also use %s for this problem. I'm trying to make the last printf statement print the exact input from standard input.
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#define INITIAL_BUFFER_SIZE 16
// Input: pointer to the the old_Buffer i.e. *buffer and the pointer to the old_Buffer size i.e. *buffer_size
// Output: pointer to the new_Buffer i.e. *temp
// Summary: Function to increase the buffer size to double whenever the old_Buffer reaches the max possible size
char* IncreaseBuffer(char *buffer,int *buffer_size){
// Creating a new buffer of double the size
int temp_sz = *buffer_size;
temp_sz = 2*temp_sz;
char *temp;
temp = realloc(buffer, temp_sz);
// If the allocation is not successful, then exit the program and print the error
if (!temp) {
printf("Error: Unable to Realloc\n");
exit(EXIT_FAILURE);
}
// Update the buffer size as per the new buffer and return the new buffer instead of the old buffer
*buffer_size = temp_sz;
return temp;
}
int main(void){
// INITIAL BUFFER
char *myString;
myString = malloc(INITIAL_BUFFER_SIZE);
int curr_size = INITIAL_BUFFER_SIZE;
// TEMPORARY CHARACTER TO STORE THE READ CHARACTER
char ch;
printf("Enter a string: ");
// Number of buffer increases
int buff_inc = 0;
// Length of the string
int len = 0;
while((ch=getchar())!=EOF){
if(ch == '\n'){
// If character read is a new line, then we break and assume that we have got our string to print by now
break;
}else{
if(len >= curr_size - 1){
// If length of the string is greater than the buffer size, then we increase the buffer size
// Also increment the number of buffer increases
myString = IncreaseBuffer(myString, &curr_size);
buff_inc++;
}
// Append the read character to the end of the buffer
myString[len++] = ch;
}
}
printf("String size: %d\n", len);
printf("Buffer increases: %d\n", buff_inc);
printf("You entered: %s\n",myString);
return 0;
}

Answer 1

You must not free the old buffer after calling realloc. That is bad. It has already been resized and memory allocation taken care of. It might even keep the same address after reallocation.
Just remove the following lines:
// Free the old buffer
free(buffer);
buffer = NULL;
And, already pointed out in the comments, you forgot to terminate your string. Do this after the loop:
myString[len] = '\0';

Answer 2

Trimmed down after just seeing #paddy's answer, but for the record this is from the realloc docs:
On success, returns the pointer to the beginning of newly allocated memory. The returned pointer must be deallocated with free() or realloc(). The original pointer ptr is invalidated and any access to it is undefined behavior (even if reallocation was in-place).
On failure, returns a null pointer. The original pointer ptr remains valid and may need to be deallocated with free() or realloc().