Why doesn't work my code, even though it is true? - c

Question

this code firstly takes two words for user. Then, it check those length with a function. Then the code send the words and their length to another function for it to find commen letters in these words. The same function also print that how many commen letters they have.(The user enter just lower letter or just capital letters)
for example:
input1: emirhan
input2: celek
output: The words that you entered have 2 common letters
output shouldn't be 3 because input2 (celek) has 2 'e' and the code count just one of them.
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define MAX 40
int length(char word[30]) {
int uzun;
uzun = strlen(word) - 1;
return uzun;
}
int equation(char x[MAX], char y[MAX], int length1, int length2) {
int i, j, k, l;
int sayac = 0; // sayac means counter
if (length1 >= length2) {
for (i = 0; i < length1; i++) {
for (j = 0; j < length2; i++) {
if (x[i] == y[j]) { // if the code find a common letter,it will enter if
sayac++;
for (k = i + 1; k < length1; k++) { //This 'for' check that does first word same letter or not?
if (x[k] == x[i]) {
sayac--;
}
}
for (l = j + 1; l < length2; l++) { //This 'for' check that does second word same letter or not?
if (y[l] == y[j]) {
sayac--;
}
}
}
}
}
}
if (length1 < length2) {
for (i = 0; i < length2; i++) {
for (j = 0; j < length1; i++) {
if (x[i] == y[j]) {
sayac++;
for (k = i + 1; k < length2; k++) {
if (x[k] == x[i]) {
sayac--;
}
}
for (l = j + 1; l < length1; l++) {
if (y[l] == y[j]) {
sayac--;
}
}
}
}
}
}
printf("The words that you entered have %d common letters", sayac);
}
int main() {
char x[MAX]; //input1
char y[MAX]; //input2
int length1; // length of first word
int length2; // length of second word
printf("PLS, enter the first word:");
fgets(x, sizeof(x), stdin);
printf("PLS, enter the second word:");
fgets(y, sizeof(y), stdin);
length1 = length(x);
length2 = length(y);
equation(x, y, length1, length2);
return 0;
}

Answer 1

I edited the my code again and I solved the problem. I had a mistake in loops. I coded loops again.
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define MAX 40
int length(char word[30]) {
int uzun;
uzun = strlen(word) - 1;
return uzun;
}
void equation(char x[MAX], char y[MAX], int length1, int length2) {
int i, j, k, l;
int sayac = 0; // sayac means counter
for (i = 0; i < length1; i++) {
for (j = 0; j < length2; j++) {
if (x[i] == y[j]) { // if the code find a common letter,it will enter if
sayac++;
for (k = i + 1; k < length1; k++) { //This 'for' check that does first word same letter or not?
if (x[k] == x[i]) {
sayac--;
}
}
for (l = j + 1; l < length2; l++) { //This 'for' check that does second word same letter or not?
if (y[l] == y[j]) {
sayac--;
}
}
}
}
}
printf("The words that you entered have %d common letters", sayac);
}
int main() {
char x[MAX]; //input1
char y[MAX]; //input2
int length1; // length of first word
int length2; // length of second word
printf("PLS, enter the first word:");
fgets(x, sizeof(x), stdin);
printf("PLS, enter the second word:");
fgets(y, sizeof(y), stdin);
length1 = length(x);
length2 = length(y);
equation(x, y, length1, length2);
return 0;
}