How do I count how many times a letter appears in a string? C programming

I am trying to write a program to tell me how many 'e' letters are in the phrase "Yesterday, all my troubles seemed so far away". I am trying to do this using strcmp function and I want to compare each letter in the phrase to the letter 'e' and then make it so that the count increments.

int main(void) {
  int i, x, count = 0;
  char words[] = "Yesterday, all my troubles seemed so far away", letter;
  char str1 = "e";
  for (i = 0; i < 45; i++) {
    letter = words[i];
    x = strcmp(letter, str1);
    if (x == 0) {
      count++;
    }
  }
  printf("The number of times %c appears is %d.\n", str1, count);
}

You can simply compare your string characters against the character 'e' like so

#include <stdio.h>
#include <string.h>

int main(void)
{
    int i, count = 0;
    char words[] ="Yesterday, all my troubles seemed so far away";

    for (i = 0; i < strlen(words); i++){
        if (words[i] == 'e') {
            count++;
        }
    }
    printf("The number of times %c appears is %d.\n", 'e', count);
}